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/include/clang/Driver/CC1Options.td b/include/clang/Driver/CC1Options.td
index d693270..892868d 100644
--- a/include/clang/Driver/CC1Options.td
+++ b/include/clang/Driver/CC1Options.td
@@ -314,6 +314,8 @@
   HelpText<"Build ASTs then convert to LLVM, emit .bc file">;
 def emit_llvm_only : Flag<"-emit-llvm-only">,
   HelpText<"Build ASTs and convert to LLVM, discarding output">;
+def emit_codegen_only : Flag<"-emit-codegen-only">,
+  HelpText<"Generate machine code, but discard output">;
 def emit_obj : Flag<"-emit-obj">,
   HelpText<"Emit native object files">;
 def rewrite_test : Flag<"-rewrite-test">,