Fix PR 106600: __builtin_bswap32 is not hooked up for ZBB for 32bit

Fix PR 106600: __builtin_bswap32 is not hooked up for ZBB for 32bit

The problem here is the bswap<mode>2 pattern had a check for TARGET_64BIT
but then used the X iterator. Since the X iterator is either SI or DI depending
on the setting TARGET_64BIT, there is no reason for the TARGET_64BIT.

OK? Built and tested on both riscv32-linux-gnu and riscv64-linux-gnu.

Thanks,
Andrew Pinski

gcc/ChangeLog:

	PR target/106600
	* config/riscv/bitmanip.md (bswap<mode>2): Remove
	condition on TARGET_64BIT as X is already conditional there.

gcc/testsuite/ChangeLog:

	PR target/106600
	* gcc.target/riscv/zbb_32_bswap-1.c: New test.
	* gcc.target/riscv/zbb_bswap-1.c: New test.