[CIR] Add options to emit ClangIR and enable the ClangIR pipeline

Introduce just the option definitions and support for their existance at
a few different points in the frontend. This will be followed soon by
functionality that uses it.

Reviewers: bcardosolopes, jansvoboda11, AaronBallman, erichkeane, MaskRay

Reviewed By: erichkeane

Pull Request: https://github.com/llvm/llvm-project/pull/89030

1 files changed, 2 insertions, 0 deletions

diff --git a/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp b/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
index f85f036..7476b10 100644
--- a/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
+++ b/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp
@@ -53,6 +53,8 @@ CreateFrontendBaseAction(CompilerInstance &CI) {
   case DumpTokens:             return std::make_unique<DumpTokensAction>();
   case EmitAssembly:           return std::make_unique<EmitAssemblyAction>();
   case EmitBC:                 return std::make_unique<EmitBCAction>();
+  case EmitCIR:
+    llvm_unreachable("CIR suppport not built into clang");
   case EmitHTML:               return std::make_unique<HTMLPrintAction>();
   case EmitLLVM:               return std::make_unique<EmitLLVMAction>();
   case EmitLLVMOnly:           return std::make_unique<EmitLLVMOnlyAction>();