Driver/Frontend: Add -emit-codegen-only, for running irgen + codegen but not the
.s printer or .o writer.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@104623 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 6239caf..b6a233d 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -316,6 +316,7 @@
   case frontend::EmitHTML:               return "-emit-html";
   case frontend::EmitLLVM:               return "-emit-llvm";
   case frontend::EmitLLVMOnly:           return "-emit-llvm-only";
+  case frontend::EmitCodeGenOnly:        return "-emit-codegen-only";
   case frontend::EmitObj:                return "-emit-obj";
   case frontend::FixIt:                  return "-fixit";
   case frontend::GeneratePCH:            return "-emit-pch";
@@ -927,6 +928,8 @@
       Opts.ProgramAction = frontend::EmitLLVM; break;
     case OPT_emit_llvm_only:
       Opts.ProgramAction = frontend::EmitLLVMOnly; break;
+    case OPT_emit_codegen_only:
+      Opts.ProgramAction = frontend::EmitCodeGenOnly; break;
     case OPT_emit_obj:
       Opts.ProgramAction = frontend::EmitObj; break;
     case OPT_fixit_EQ: