[ms-inline asm] The MCInstrDesc only tracks register definitions.  For now,
assume that if the 1st operands is an expression and the instruction mayStore,
then it is a memory definition.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@163144 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaStmtAsm.cpp b/lib/Sema/SemaStmtAsm.cpp
index 2af2afe..b6a4e62 100644
--- a/lib/Sema/SemaStmtAsm.cpp
+++ b/lib/Sema/SemaStmtAsm.cpp
@@ -624,7 +624,8 @@
             ExprResult Result = ActOnIdExpression(getCurScope(), SS, Loc, Id,
                                                   false, false);
             if (!Result.isInvalid()) {
-              if (isDef) {
+              bool isMemDef = (i == 1) && Desc.mayStore();
+              if (isDef || isMemDef) {
                 Outputs.push_back(II);
                 OutputExprs.push_back(Result.take());
                 OutputConstraints.push_back("=r");