[PATCH] Add support for nested blocks in Microsoft inline assembly

[David Majnemer]

LGTM with requested changes addressed.

================
Comment at: lib/Parse/ParseStmtAsm.cpp:463
@@ -432,3 +462,3 @@
   }
 
   // If we don't support assembly, or the assembly is empty, we don't
----------------
We should probably assert that LBraceLocs isn't empty at this point.

http://reviews.llvm.org/D4399