c, ubsan: Instrument even shortened divisions [PR109151]

c, ubsan: Instrument even shortened divisions [PR109151]

On the following testcase, the C FE decides to shorten the division because
it has a guarantee that INT_MIN / -1 division won't be encountered, the
first operand is widened from narrower unsigned and/or the second operand is
a constant other than all ones (in this case both are true).
The problem is that the narrower type in this case is _Bool and
ubsan_instrument_division only instruments it if op0's type is INTEGER_TYPE
or REAL_TYPE.  Strangely this doesn't happen in C++ FE.
Anyway, we only shorten divisions if the INT_MIN / -1 case is impossible,
so I think we should be fine even with -fstrict-enums in C++ in case it
shortened to ENUMERAL_TYPEs.

The following patch just instruments those on the ubsan_instrument_division
side.  Perhaps only the first hunk and testcase might be needed because
we shouldn't shorten if the other case could be triggered.

2023-03-17  Jakub Jelinek  <jakub@redhat.com>

	PR c/109151
	* c-ubsan.cc (ubsan_instrument_division): Handle all scalar integral
	types rather than just INTEGER_TYPE.

	* c-c++-common/ubsan/div-by-zero-8.c: New test.

(cherry picked from commit 103d423f6ce72ccb03d55b7b1dfa2dabd5854371)