[clang-tidy] Fix crash on end location inside macro

Summary:
Lexer::getLocForEndOfToken is defined to return an
invalid location if the given location is inside a macro.
Other checks conditionally warn based off location
validity. Updating this check to do the same.

Reviewers: JonasToth, aaron.ballman, nickdesaulniers

Reviewed By: nickdesaulniers

Subscribers: lebedev.ri, nickdesaulniers, xazax.hun, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D64607

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@366353 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed