Auto merge of #87581 - Amanieu:asm_clobber_abi, r=nagisa

Add support for clobber_abi to asm!

This PR adds the `clobber_abi` feature that was proposed in #81092.

Fixes #81092

cc `@rust-lang/wg-inline-asm`

r? `@nagisa`

compiler/rustc_codegen_llvm/src/asm.rs

@@ -302,7 +302,14 @@ impl AsmBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
                         "~{flags}".to_string(),
                     ]);
                 }
-                InlineAsmArch::RiscV32 | InlineAsmArch::RiscV64 => {}
+                InlineAsmArch::RiscV32 | InlineAsmArch::RiscV64 => {
+                    constraints.extend_from_slice(&[
+                        "~{vtype}".to_string(),
+                        "~{vl}".to_string(),
+                        "~{vxsat}".to_string(),
+                        "~{vxrm}".to_string(),
+                    ]);
+                }
                 InlineAsmArch::Nvptx64 => {}
                 InlineAsmArch::PowerPC | InlineAsmArch::PowerPC64 => {}
                 InlineAsmArch::Hexagon => {}