[CodeGen] use nsw negation for builtin abs
The clang builtins have the same semantics as the stdlib functions.
The stdlib functions are defined in section 126.96.36.199 of the C standard with:
"If the result cannot be represented, the behavior is undefined."
That lets us mark the negation with 'nsw' because "sub i32 0, INT_MIN" would
Differential Revision: https://reviews.llvm.org/D47202