[NFC] Drop getSourceFileKind

Author: CodaFi

include/swift/Frontend/Frontend.h

@@ -294,9 +294,6 @@ class CompilerInvocation {
   InputFileKind getInputKind() const {
     return FrontendOpts.InputKind;
   }
-
-  SourceFileKind getSourceFileKind() const;
-
   void setModuleName(StringRef Name) {
     FrontendOpts.ModuleName = Name.str();
     IRGenOpts.ModuleName = Name.str();

lib/Frontend/CompilerInvocation.cpp

@@ -226,25 +226,6 @@ void CompilerInvocation::setSDKPath(const std::string &Path) {
   updateRuntimeLibraryPaths(SearchPathOpts, LangOpts.Target);
 }
 
-SourceFileKind CompilerInvocation::getSourceFileKind() const {
-  switch (getInputKind()) {
-  case InputFileKind::Swift:
-    return SourceFileKind::Main;
-  case InputFileKind::SwiftLibrary:
-    return SourceFileKind::Library;
-  case InputFileKind::SwiftModuleInterface:
-    return SourceFileKind::Interface;
-  case InputFileKind::SIL:
-    return SourceFileKind::SIL;
-  case InputFileKind::None:
-  case InputFileKind::LLVM:
-  case InputFileKind::ObjCHeader:
-    llvm_unreachable("Trying to convert from unsupported InputFileKind");
-  }
-
-  llvm_unreachable("Unhandled InputFileKind in switch.");
-}
-
 static bool ParseFrontendArgs(
     FrontendOptions &opts, ArgList &args, DiagnosticEngine &diags,
     SmallVectorImpl<std::unique_ptr<llvm::MemoryBuffer>> *buffers) {

lib/Frontend/Frontend.cpp

@@ -783,8 +783,6 @@ bool CompilerInstance::createFilesForMainModule(
     ModuleDecl *mod, SmallVectorImpl<FileUnit *> &files) const {
   // Make sure the main file is the first file in the module.
   if (MainBufferID != NO_SUCH_BUFFER) {
-    auto *mainFile = createSourceFileForMainModule(
-        mod, Invocation.getSourceFileKind(), MainBufferID);
     files.push_back(mainFile);
   }