[libc][NFC] Use RemoveCVType to implement IsIntegral and IsPointerType.

Added IsSameV as a convenience variable and used it where convenient.

Reviewers: abrachet, lntue

Differential Revision: https://reviews.llvm.org/D83980

GitOrigin-RevId: 7738c0341829bdc49d0ad4e9694bdd64aa332023
1 file changed