[Bug target/118103] [15 Regression] GCC miscompile rvv intrinsics at `-O3`, missing the `fsrm` instruction to the recover status of frm CSR

[pan2.li at intel dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118103

--- Comment #11 from Li Pan <pan2.li at intel dot com> ---
TARGET_CONDITIONAL_REGISTER_USAGE can help to resolve this issue, let me have a
try for regression test.

But looks we don't need to emit_volatile_frm anymore here, but it is another
refactor later.