Implement -emit-llvm-bc option

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@45339 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/ASTConsumers.h b/Driver/ASTConsumers.h
index ab8880d..0412c7a 100644
--- a/Driver/ASTConsumers.h
+++ b/Driver/ASTConsumers.h
@@ -41,6 +41,11 @@
 
 ASTConsumer *CreateLLVMEmitter(Diagnostic &Diags, const LangOptions &Features);
 
+ASTConsumer *CreateBCWriter(const std::string& InFile,
+                            const std::string& OutFile,
+                            Diagnostic &Diags,
+                            const LangOptions &LOpts);
+
 ASTConsumer *CreateCodeRewriterTest(Diagnostic &Diags);
 
 ASTConsumer *CreateSerializationTest(Diagnostic &Diags,