Don't allow hybrid assembler unless filetype=iasm.

src/IceClFlags.cpp

Index: src/IceClFlags.cpp
diff --git a/src/IceClFlags.cpp b/src/IceClFlags.cpp
index 907e240f35794113cbfde1f72940269aebba9436..1f4f3956a00b57c2061c4e1a4c0fedc7458d76b1 100644
--- a/src/IceClFlags.cpp
+++ b/src/IceClFlags.cpp
@@ -451,7 +451,8 @@ void ClFlags::getParsedClFlags(ClFlags &OutFlags) {
   OutFlags.setDecorateAsm(::DecorateAsm);
   OutFlags.setDefaultFunctionPrefix(::DefaultFunctionPrefix);
   OutFlags.setDefaultGlobalPrefix(::DefaultGlobalPrefix);
-  OutFlags.setDisableHybridAssembly(::DisableHybridAssembly);
+  OutFlags.setDisableHybridAssembly(::DisableHybridAssembly ||
+                                    (::OutFileType != Ice::FT_Iasm));
   OutFlags.setDisableInternal(::DisableInternal);
   OutFlags.setDisableIRGeneration(::DisableIRGeneration);
   OutFlags.setDisableTranslation(::DisableTranslation);