rtl: builtins: Fix builtins feclearexcept and feraiseexcept operand check [PR94193]

rtl: builtins: Fix builtins feclearexcept and feraiseexcept operand check [PR94193]

Commit 4343f5e25679 ("rtl: builtins: (not just) rs6000: Add builtins
for fegetround, feclearexcept and feraiseexcept [PR94193]") broke gcc
bootstra when building with --enable-checking=rtl[1].

The function expand_builtin_feclear_feraise_except was failing to
proper validate op0 predicate before emit_insn leading to the mismatch
type failure.

[1] https://gcc.gnu.org/pipermail/gcc-patches/2022-January/589186.html

2022-01-26  Raoni Fassina Firmino  <raoni@linux.ibm.com>

gcc/
	PR target/94193
	* builtins.cc (expand_builtin_feclear_feraise_except): Add op0
	predicate check.

Signed-off-by: Raoni Fassina Firmino <raoni@linux.ibm.com>