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/tools/driver/cc1_main.cpp b/tools/driver/cc1_main.cpp
index 6dc3a7f..ac19e93 100644
--- a/tools/driver/cc1_main.cpp
+++ b/tools/driver/cc1_main.cpp
@@ -71,6 +71,7 @@
   case EmitHTML:               return new HTMLPrintAction();
   case EmitLLVM:               return new EmitLLVMAction();
   case EmitLLVMOnly:           return new EmitLLVMOnlyAction();
+  case EmitCodeGenOnly:        return new EmitCodeGenOnlyAction();
   case EmitObj:                return new EmitObjAction();
   case FixIt:                  return new FixItAction();
   case GeneratePCH:            return new GeneratePCHAction();