PCH: When deserializing an explicit "external definition", don't pass it to HandleTopLevelDecl -- this is already being done inside the reader.

This is something of a hack, since whether the reader actually did this depends on the "isConsumerInterestedIn" predicate. I think we need to rework how this works, but I need to discuss with Doug.

llvm-svn: 82111
diff --git a/clang/lib/Frontend/PCHReaderDecl.cpp b/clang/lib/Frontend/PCHReaderDecl.cpp
index c3c05b0..67ffabb 100644
--- a/clang/lib/Frontend/PCHReaderDecl.cpp
+++ b/clang/lib/Frontend/PCHReaderDecl.cpp
@@ -640,6 +640,8 @@
 /// code generation, e.g., inline function definitions, Objective-C
 /// declarations with metadata, etc.
 static bool isConsumerInterestedIn(Decl *D) {
+  if (isa<FileScopeAsmDecl>(D))
+    return true;
   if (VarDecl *Var = dyn_cast<VarDecl>(D))
     return Var->isFileVarDecl() && Var->getInit();
   if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D))
@@ -794,4 +796,3 @@
 
   return D;
 }
-