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Catch more cases when diagnosing integer-constant-expression overflows.

Authored by jmagee on Feb 4 2015, 1:50 PM.

Description

Catch more cases when diagnosing integer-constant-expression overflows.

When visiting AssignmentOps, keep evaluating after a failure (when possible) in
order to identify overflow in subexpressions.

Differential Revision: http://reviews.llvm.org/D1238

llvm-svn: 228202

Details