[Profiler] Separate profiler instances for property inits and constructors (#25247)

Assign separate SILProfiler instances to stored property initializers
and constructors.

Starting with rdar://39460313, coverage reporting for these constructs
was bundled up into a single SILProfiler uniqued by the NominalTypeDecl.
There are two problems with doing this.

First, the shared SILProfiler is given a fake name that can't be
demangled. That breaks Xcode's reports.  Second, the relationship
between SILProfiler and SILFunction is supposed to be 1:1. Having a
shared SILProfiler muddies things a bit and requires extra bookkeeping.

rdar://47467864

lib/SILGen/SILGenFunction.cpp

@@ -612,7 +612,8 @@ void SILGenFunction::emitArtificialTopLevel(ClassDecl *mainClass) {
   }
 }
 
-void SILGenFunction::emitGeneratorFunction(SILDeclRef function, Expr *value) {
+void SILGenFunction::emitGeneratorFunction(SILDeclRef function, Expr *value,
+                                           bool EmitProfilerIncrement) {
   MagicFunctionName = SILGenModule::getMagicFunctionName(function);
 
   RegularLocation Loc(value);
@@ -635,6 +636,8 @@ void SILGenFunction::emitGeneratorFunction(SILDeclRef function, Expr *value) {
   auto interfaceType = value->getType()->mapTypeOutOfContext();
   emitProlog(/*paramList=*/nullptr, /*selfParam=*/nullptr, interfaceType,
              dc, false);
+  if (EmitProfilerIncrement)
+    emitProfilerIncrement(value);
   prepareEpilog(value->getType(), false, CleanupLocation::get(Loc));
   emitReturnExpr(Loc, value);
   emitEpilog(Loc);