[flang] Add IntrinsicProcTable::IsSpecificIntrinsicFunction

This replaces IsUnrestrictedSpecificIntrinsicFunction and returns
information that allows the caller to distinguish between restricted
and unrestricted intrinsics.

The new case in `resolve46.f90` used to get an internal error.

Original-commit: flang-compiler/f18@4cb1ee10b90bbc5e3c4899ab136fad4d1e841195
Reviewed-on: https://github.com/flang-compiler/f18/pull/928
Tree-same-pre-rewrite: false