Fix an off by one error.

Part of rdar://9037836 and rdar://9119939


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132590 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 2 deletions

diff --git a/lib/VMCore/InlineAsm.cpp b/lib/VMCore/InlineAsm.cpp
index 70d0e3881e..c4e065df05 100644
--- a/lib/VMCore/InlineAsm.cpp
+++ b/lib/VMCore/InlineAsm.cpp
@@ -185,11 +185,10 @@ bool InlineAsm::ConstraintInfo::Parse(StringRef Str,
       // Multi-letter constraint
       // These will only occur with the existing multiple alternative
       // constraints and so we can use the isalpha loop below.
-      StringRef::iterator ConStart = I;
+      StringRef::iterator ConStart = ++I;
       while (I != E && isalpha(*I))
         ++I;
       pCodes->push_back(std::string(ConStart, I));
-      ++I;
     } else {
       // Single letter constraint.
       pCodes->push_back(std::string(I, I+1));