Commit r331416 breaks the big-endian PPC bot. On the big endian build, we
actually encounter constants wider than 64-bits. Add the guard to prevent
tripping the assert.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331420 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed