ubsan: Use -fno{,-}sanitize=float-divide-by-zero for float division by zero recovery...

ubsan: Use -fno{,-}sanitize=float-divide-by-zero for float division by zero recovery [PR102515]

We've been using
-f{,no-}sanitize-recover=integer-divide-by-zero to decide on the float
-fsanitize=float-divide-by-zero instrumentation _abort suffix.
This patch fixes it to use -f{,no-}sanitize-recover=float-divide-by-zero
for it instead.

2021-10-01  Jakub Jelinek  <jakub@redhat.com>
	    Richard Biener  <rguenther@suse.de>

	PR sanitizer/102515
gcc/c-family/
	* c-ubsan.c (ubsan_instrument_division): Check the right
	flag_sanitize_recover bit, depending on which sanitization
	is done.
gcc/testsuite/
	* c-c++-common/ubsan/float-div-by-zero-2.c: New test.

(cherry picked from commit 9c1a633d96926357155d4702b66f8a0ec856a81f)