Daniel Dunbar 9146d0e89c Add SMLoc::isValid method.
- To support using SMLoc as a sentinel.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74474 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-29 23:28:55 +00:00
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