Fix a typo: use of cast where dyn_cast was intended
Fix a typo: use of cast where dyn_cast was intended

This bug has the effect of converting a test of isGCRelocate(InvokeInst*) from a false return to a crash.  

This may be the root cause of the crash Joerg reported against r223137, but I'm still waiting for a clean build of clang to complete to be able to confirm.  Once I've confirmed the issue, I'll submit a test case separately.  



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@223370 91177308-0d34-0410-b5e6-96231b3b80d8

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