[RISC-V][PR target/120223] Don't use bset/binv for XTHEADBS

Thead has the XTHEADBB extension which has a lot of overlap with Zbb.  I made
the incorrect assumption that XTHEADBS would largely be like Zbs when
generalizing Shreya's work.

As a result we can't use the operation synthesis code for IOR/XOR because we
don't have binv/bset like capabilities.  I should have double checked on
XTHEADBS, my bad.

Anyway, the fix is trivial.  Don't allow bset/binv based on XTHEADBS.

Already spun in my tester.  Spinning in the pre-commit CI system now.

	PR target/120223
gcc/
	* config/riscv/riscv.cc (synthesize_ior_xor): XTHEADBS does not have
	single bit manipulations.

gcc/testsuite/

	* gcc.target/riscv/pr120223.c: New test.

0 files changed, 0 insertions, 0 deletions