Refactor: Simplify boolean expressions in llvm IR

Simplify boolean expressions using `true` and `false` with `clang-tidy`

Patch by Richard Thomson with a few other simplifications to fix
else-after-returns in the surrounding code.

Differential Revision: http://reviews.llvm.org/D8527

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233005 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed