[NFC] Remove CompilerInstance::setSILModule

The REPL was using the CompilerInstance to stash this parameter, then it would immediately move it into IRGen.  Drop the setter and pass this data directly.

include/swift/Frontend/Frontend.h

@@ -484,11 +484,6 @@ public:
   }
   DependencyTracker *getDependencyTracker() { return DepTracker.get(); }
 
-  /// Set the SIL module for this compilation instance.
-  ///
-  /// The CompilerInstance takes ownership of the given SILModule object.
-  void setSILModule(std::unique_ptr<SILModule> M);
-
   SILModule *getSILModule() {
     return TheSILModule.get();
   }

include/swift/Immediate/Immediate.h

@@ -18,6 +18,7 @@
 #ifndef SWIFT_IMMEDIATE_IMMEDIATE_H
 #define SWIFT_IMMEDIATE_IMMEDIATE_H
 
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -25,6 +26,7 @@ namespace swift {
   class CompilerInstance;
   class IRGenOptions;
   class SILOptions;
+  class SILModule;
 
   // Using LLVM containers to store command-line arguments turns out
   // to be a lose, because LLVM's execution engine demands this vector
@@ -37,7 +39,8 @@ namespace swift {
   ///
   /// \return the result returned from main(), if execution succeeded
   int RunImmediately(CompilerInstance &CI, const ProcessCmdLine &CmdLine,
-                     const IRGenOptions &IRGenOpts, const SILOptions &SILOpts);
+                     const IRGenOptions &IRGenOpts, const SILOptions &SILOpts,
+                     std::unique_ptr<SILModule> &&SM);
 
   void runREPL(CompilerInstance &CI, const ProcessCmdLine &CmdLine,
                bool ParseStdlib);

lib/Frontend/Frontend.cpp

@@ -185,10 +185,6 @@ void CompilerInstance::createSILModule() {
       Invocation.getFrontendOptions().InputsAndOutputs.isWholeModule());
 }
 
-void CompilerInstance::setSILModule(std::unique_ptr<SILModule> M) {
-  TheSILModule = std::move(M);
-}
-
 void CompilerInstance::recordPrimaryInputBuffer(unsigned BufID) {
   PrimaryBufferIDs.insert(BufID);
 }
@@ -618,7 +614,7 @@ std::unique_ptr<SILModule> CompilerInstance::takeSILModule() {
   return std::move(TheSILModule);
 }
 
-ModuleDecl *CompilerInstance::getMainModule() {
+ModuleDecl *CompilerInstance::getMainModule() const {
   if (!MainModule) {
     Identifier ID = Context->getIdentifier(Invocation.getModuleName());
     MainModule = ModuleDecl::create(ID, *Context);

lib/FrontendTool/FrontendTool.cpp

@@ -1383,7 +1383,7 @@ static void generateIR(const IRGenOptions &IRGenOpts,
 
 static bool processCommandLineAndRunImmediately(const CompilerInvocation &Invocation,
                                                 CompilerInstance &Instance,
-                                                std::unique_ptr<SILModule> SM,
+                                                std::unique_ptr<SILModule> &&SM,
                                                 ModuleOrSourceFile MSF,
                                                 FrontendObserver *observer,
                                                 int &ReturnValue) {
@@ -1392,8 +1392,6 @@ static bool processCommandLineAndRunImmediately(const CompilerInvocation &Invoca
   const IRGenOptions &IRGenOpts = Invocation.getIRGenOptions();
   const ProcessCmdLine &CmdLine =
       ProcessCmdLine(opts.ImmediateArgv.begin(), opts.ImmediateArgv.end());
-  Instance.setSILModule(std::move(SM));
-
 
   PrettyStackTraceStringAction trace(
       "running user code",

lib/Immediate/Immediate.cpp

@@ -237,7 +237,8 @@ bool swift::immediate::autolinkImportedModules(ModuleDecl *M,
 int swift::RunImmediately(CompilerInstance &CI,
                           const ProcessCmdLine &CmdLine,
                           const IRGenOptions &IRGenOpts,
-                          const SILOptions &SILOpts) {
+                          const SILOptions &SILOpts,
+                          std::unique_ptr<SILModule> &&SM) {
   ASTContext &Context = CI.getASTContext();
   
   // IRGen the main module.
@@ -246,7 +247,7 @@ int swift::RunImmediately(CompilerInstance &CI,
   // FIXME: We shouldn't need to use the global context here, but
   // something is persisting across calls to performIRGeneration.
   auto ModuleOwner = performIRGeneration(
-      IRGenOpts, swiftModule, CI.takeSILModule(), swiftModule->getName().str(),
+      IRGenOpts, swiftModule, std::move(SM), swiftModule->getName().str(),
       PSPs, getGlobalLLVMContext(), ArrayRef<std::string>());
   auto *Module = ModuleOwner.get();