Initialize the AST consumer as soon as we have both an ASTConsumer and an
ASTContext. Fixes some cases where we could previously initialize the AST
consumer more than once.

llvm-svn: 245346
diff --git a/clang/lib/CodeGen/CodeGenAction.cpp b/clang/lib/CodeGen/CodeGenAction.cpp
index 5f199bd..062c7be 100644
--- a/clang/lib/CodeGen/CodeGenAction.cpp
+++ b/clang/lib/CodeGen/CodeGenAction.cpp
@@ -82,11 +82,8 @@
     }
 
     void Initialize(ASTContext &Ctx) override {
-      if (Context) {
-        assert(Context == &Ctx);
-        return;
-      }
-        
+      assert(!Context && "initialized multiple times");
+
       Context = &Ctx;
 
       if (llvm::TimePassesIsEnabled)