[Diagnostics] Use Expr::isKnownToHaveBooleanValue() to check bitwise negation of bool in languages without a bool type

Thanks for this advice, Richard Trieu!



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@373817 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed