Clear the map that associated the rewritten block with it's corresponding BlockExpr.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@57053 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Driver/RewriteBlocks.cpp b/Driver/RewriteBlocks.cpp
index 9bced96..e22f1e5 100644
--- a/Driver/RewriteBlocks.cpp
+++ b/Driver/RewriteBlocks.cpp
@@ -605,6 +605,7 @@
     ImportedBlockDecls.clear();
   }
   Blocks.clear();
+  RewrittenBlockExprs.clear();
 }
 
 void RewriteBlocks::InsertBlockLiteralsWithinFunction(FunctionDecl *FD) {