AST: Remove some unnecessary calls to setGenericSignature()

lib/AST/Decl.cpp

@@ -3876,9 +3876,6 @@ GetDestructorRequest::evaluate(Evaluator &evaluator, ClassDecl *CD) const {
   // Propagate access control and versioned-ness.
   DD->copyFormalAccessFrom(CD, /*sourceIsParentContext*/true);
 
-  // Wire up generic environment of DD.
-  DD->setGenericSignature(CD->getGenericSignatureOfContext());
-
   // Mark DD as ObjC, as all dtors are.
   DD->setIsObjC(ctx.LangOpts.EnableObjCInterop);
   if (ctx.LangOpts.EnableObjCInterop)

lib/ClangImporter/ImportDecl.cpp

@@ -1715,7 +1715,6 @@ buildSubscriptGetterDecl(ClangImporter::Implementation &Impl,
                      TypeLoc::withoutLoc(elementTy), dc,
                      getter->getClangNode());
 
-  thunk->setGenericSignature(dc->getGenericSignatureOfContext());
   thunk->computeType();
 
   thunk->setAccess(getOverridableAccessLevel(dc));
@@ -1769,7 +1768,6 @@ buildSubscriptSetterDecl(ClangImporter::Implementation &Impl,
                      valueIndicesPL,
                      TypeLoc::withoutLoc(TupleType::getEmpty(C)), dc,
                      setter->getClangNode());
-  thunk->setGenericSignature(dc->getGenericSignatureOfContext());
   thunk->computeType();
 
   thunk->setAccess(getOverridableAccessLevel(dc));
@@ -3735,8 +3733,6 @@ namespace {
                                     nameLoc, bodyParams, resultTy,
                                     /*throws*/ false, dc, decl);
 
-      result->setGenericSignature(dc->getGenericSignatureOfContext());
-
       if (!dc->isModuleScopeContext()) {
         if (selfIsInOut)
           result->setSelfAccessKind(SelfAccessKind::Mutating);
@@ -4324,8 +4320,6 @@ namespace {
       // Record the return type.
       result->getBodyResultTypeLoc().setType(resultTy);
 
-      result->setGenericSignature(dc->getGenericSignatureOfContext());
-
       // Optional methods in protocols.
       if (decl->getImplementationControl() == clang::ObjCMethodDecl::Optional &&
           isa<ProtocolDecl>(dc))
@@ -6331,7 +6325,6 @@ ConstructorDecl *SwiftDeclConverter::importConstructor(
   addObjCAttribute(result, selector);
 
   // Calculate the function type of the result.
-  result->setGenericSignature(dc->getGenericSignatureOfContext());
   result->computeType();
 
   Impl.recordImplicitUnwrapForDecl(result,
@@ -6762,8 +6755,6 @@ SwiftDeclConverter::importSubscript(Decl *decl,
   if (setterObjCMethod)
     Impl.importAttributes(setterObjCMethod, setterThunk);
 
-  subscript->setGenericSignature(dc->getGenericSignatureOfContext());
-
   subscript->setIsSetterMutating(false);
   makeComputed(subscript, getterThunk, setterThunk);
   subscript->computeType();

lib/Sema/DerivedConformanceCodable.cpp

@@ -750,7 +750,6 @@ static FuncDecl *deriveEncodable_encode(DerivedConformance &derived) {
     encodeDecl->getAttrs().add(attr);
   }
 
-  encodeDecl->setGenericSignature(conformanceDC->getGenericSignatureOfContext());
   encodeDecl->computeType(FunctionType::ExtInfo().withThrows());
 
   encodeDecl->copyFormalAccessFrom(derived.Nominal,
@@ -1031,7 +1030,6 @@ static ValueDecl *deriveDecodable_init(DerivedConformance &derived) {
     initDecl->getAttrs().add(reqAttr);
   }
 
-  initDecl->setGenericSignature(conformanceDC->getGenericSignatureOfContext());
   initDecl->computeType(AnyFunctionType::ExtInfo().withThrows());
 
   initDecl->copyFormalAccessFrom(derived.Nominal,

lib/Sema/DerivedConformanceCodingKey.cpp

@@ -144,7 +144,6 @@ static ValueDecl *deriveInitDecl(DerivedConformance &derived, Type paramType,
   synthesizer(initDecl);
 
   // Compute the interface type of the initializer.
-  initDecl->setGenericSignature(parentDC->getGenericSignatureOfContext());
   initDecl->computeType();
 
   initDecl->setAccess(derived.Nominal->getFormalAccess());

lib/Sema/DerivedConformanceEquatableHashable.cpp

@@ -765,7 +765,6 @@ deriveEquatable_eq(
   eqDecl->setBodySynthesizer(bodySynthesizer);
 
   // Compute the interface type.
-  eqDecl->setGenericSignature(parentDC->getGenericSignatureOfContext());
   eqDecl->computeType();
 
   eqDecl->copyFormalAccessFrom(derived.Nominal, /*sourceIsParentContext*/ true);
@@ -890,7 +889,6 @@ deriveHashable_hashInto(
   hashDecl->setImplicit();
   hashDecl->setBodySynthesizer(bodySynthesizer);
 
-  hashDecl->setGenericSignature(parentDC->getGenericSignatureOfContext());
   hashDecl->computeType();
   hashDecl->copyFormalAccessFrom(derived.Nominal);
 
@@ -1240,7 +1238,6 @@ static ValueDecl *deriveHashable_hashValue(DerivedConformance &derived) {
   getterDecl->setIsTransparent(false);
 
   // Compute the interface type of hashValue().
-  getterDecl->setGenericSignature(parentDC->getGenericSignatureOfContext());
   getterDecl->computeType();
 
   getterDecl->copyFormalAccessFrom(derived.Nominal,

lib/Sema/DerivedConformanceRawRepresentable.cpp

@@ -430,7 +430,6 @@ deriveRawRepresentable_init(DerivedConformance &derived) {
   initDecl->setBodySynthesizer(&deriveBodyRawRepresentable_init);
 
   // Compute the interface type of the initializer.
-  initDecl->setGenericSignature(parentDC->getGenericSignatureOfContext());
   initDecl->computeType();
 
   initDecl->copyFormalAccessFrom(enumDecl, /*sourceIsParentContext*/true);

lib/Sema/DerivedConformances.cpp

@@ -309,7 +309,6 @@ DerivedConformance::declareDerivedPropertyGetter(VarDecl *property,
   getterDecl->setIsTransparent(false);
 
   // Compute the interface type of the getter.
-  getterDecl->setGenericSignature(parentDC->getGenericSignatureOfContext());
   getterDecl->computeType();
 
   getterDecl->copyFormalAccessFrom(property);

lib/Sema/TypeCheckProtocol.cpp

@@ -2470,7 +2470,6 @@ void ConformanceChecker::recordTypeWitness(AssociatedTypeDecl *assocType,
                                                     SourceLoc(),
                                                     /*genericparams*/nullptr, 
                                                     DC);
-    aliasDecl->setGenericSignature(DC->getGenericSignatureOfContext());
     aliasDecl->setUnderlyingType(type);
     aliasDecl->computeType();