Don't recycle loop variables (to keep GCC happy).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162424 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaStmtAsm.cpp b/lib/Sema/SemaStmtAsm.cpp
index ed7f6ef..1293b7d 100644
--- a/lib/Sema/SemaStmtAsm.cpp
+++ b/lib/Sema/SemaStmtAsm.cpp
@@ -533,8 +533,8 @@
 
     // Canonicalize the opcode to lower case.
     SmallString<128> Opcode;
-    for (unsigned i = 0, e = IDVal.size(); i != e; ++i)
-      Opcode.push_back(tolower(IDVal[i]));
+    for (unsigned j = 0, e = IDVal.size(); j != e; ++j)
+      Opcode.push_back(tolower(IDVal[j]));
 
     // Parse the operands.
     llvm::SMLoc IDLoc;