Fix for crash issues with comma operators with a void first operand, and 
some more bullet-proofing/enhancements for tryEvaluate.  This shouldn't 
cause any behavior changes except for handling cases where we were 
crashing before and being able to evaluate a few more cases in tryEvaluate.
 
This should settle the minor mess surrounding r59196.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59224 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed