[modules] Fix a rejects-valid resulting from emitting an inline function

recursively within the emission of another inline function. This ultimately
led to us emitting the same inline function definition twice, which we then
rejected because we believed we had a mangled name conflict.

llvm-svn: 215579

clang/lib/CodeGen/ModuleBuilder.cpp

@@ -117,10 +117,14 @@ namespace {
     }
 
     void EmitDeferredDecls() {
+      if (DeferredInlineMethodDefinitions.empty())
+        return;
+
       // Emit any deferred inline method definitions. Note that more deferred
       // methods may be added during this loop, since ASTConsumer callbacks
       // can be invoked if AST inspection results in declarations being added.
-      for (unsigned I = 0; I < DeferredInlineMethodDefinitions.size(); ++I)
+      HandlingTopLevelDeclRAII HandlingDecl(*this);
+      for (unsigned I = 0; I != DeferredInlineMethodDefinitions.size(); ++I)
         Builder->EmitTopLevelDecl(DeferredInlineMethodDefinitions[I]);
       DeferredInlineMethodDefinitions.clear();
     }