Remove unneeded LLVM_FALLTHROUGH. NFC

Author: MaskRay

clang/lib/Driver/ToolChains/AIX.cpp

@@ -376,9 +376,7 @@ void AIX::AddOpenMPIncludeArgs(const ArgList &DriverArgs,
       addSystemInclude(DriverArgs, CC1Args, PathOpenMP.str());
       break;
     case Driver::OMPRT_IOMP5:
-      LLVM_FALLTHROUGH;
     case Driver::OMPRT_GOMP:
-      LLVM_FALLTHROUGH;
     case Driver::OMPRT_Unknown:
       // Unknown / unsupported include paths.
       break;

clang/tools/clang-installapi/Options.cpp

@@ -594,9 +594,7 @@ getInterfaceFile(const StringRef Filename) {
   std::unique_ptr<InterfaceFile> IF;
   switch (identify_magic(Buffer->getBuffer())) {
   case file_magic::macho_dynamically_linked_shared_lib:
-    LLVM_FALLTHROUGH;
   case file_magic::macho_dynamically_linked_shared_lib_stub:
-    LLVM_FALLTHROUGH;
   case file_magic::macho_universal_binary:
     return DylibReader::get(Buffer->getMemBufferRef());
     break;

flang/lib/Frontend/FrontendActions.cpp

@@ -861,7 +861,6 @@ getOutputStream(CompilerInstance &ci, llvm::StringRef inFile,
     return ci.createDefaultOutputFile(
         /*Binary=*/false, inFile, /*extension=*/"ll");
   case BackendActionTy::Backend_EmitFIR:
-    LLVM_FALLTHROUGH;
   case BackendActionTy::Backend_EmitHLFIR:
     return ci.createDefaultOutputFile(
         /*Binary=*/false, inFile, /*extension=*/"mlir");

llvm/lib/IR/Verifier.cpp

@@ -6226,7 +6226,6 @@ void Verifier::visitIntrinsicCall(Intrinsic::ID ID, CallBase &Call) {
     break;
   }
   case Intrinsic::experimental_convergence_entry:
-    LLVM_FALLTHROUGH;
   case Intrinsic::experimental_convergence_anchor:
     break;
   case Intrinsic::experimental_convergence_loop:

llvm/tools/llvm-readtapi/llvm-readtapi.cpp

@@ -133,9 +133,7 @@ getInterfaceFile(const StringRef Filename, bool ResetBanner = true) {
   std::unique_ptr<InterfaceFile> IF;
   switch (identify_magic(Buffer->getBuffer())) {
   case file_magic::macho_dynamically_linked_shared_lib:
-    LLVM_FALLTHROUGH;
   case file_magic::macho_dynamically_linked_shared_lib_stub:
-    LLVM_FALLTHROUGH;
   case file_magic::macho_universal_binary:
     IF = ExitOnErr(DylibReader::get(Buffer->getMemBufferRef()));
     break;