Rollup merge of #146530 - a4lg:riscv-inline-asm-default-clobber-float-flags, r=Amanieu

rustc_codegen_llvm: Adjust RISC-V inline assembly's clobber list

Despite that the `fflags` register (representing floating point exception flags) is stated as a flag register [in the reference](https://doc.rust-lang.org/reference/inline-assembly.html#r-asm.rules.preserved-registers), it's not
in the default clobber list of the RISC-V inline assembly and it would be better to fix it.

compiler/rustc_codegen_llvm/src/asm.rs

@@ -240,6 +240,7 @@ impl<'ll, 'tcx> AsmBuilderMethods<'tcx> for Builder<'_, 'll, 'tcx> {
                 }
                 InlineAsmArch::RiscV32 | InlineAsmArch::RiscV64 => {
                     constraints.extend_from_slice(&[
+                        "~{fflags}".to_string(),
                         "~{vtype}".to_string(),
                         "~{vl}".to_string(),
                         "~{vxsat}".to_string(),

tests/codegen-llvm/asm/riscv-clobbers.rs

@@ -17,7 +17,7 @@ extern crate minicore;
 use minicore::*;
 
 // CHECK-LABEL: @flags_clobber
-// CHECK: call void asm sideeffect "", "~{vtype},~{vl},~{vxsat},~{vxrm}"()
+// CHECK: call void asm sideeffect "", "~{fflags},~{vtype},~{vl},~{vxsat},~{vxrm}"()
 #[no_mangle]
 pub unsafe fn flags_clobber() {
     asm!("", options(nostack, nomem));