Rollup merge of #131310 - taiki-e:msp430-clobber-abi, r=Amanieu

Support clobber_abi in MSP430 inline assembly

This supports `clobber_abi` which is one of the requirements of stabilization mentioned in #93335.

Refs: Section 3.2 "Register Conventions" in [MSP430 Embedded Application Binary Interface](https://www.ti.com/lit/an/slaa534a/slaa534a.pdf)

cc ``@cr1901``

r? ``@Amanieu``

``@rustbot`` label +O-msp430

compiler/rustc_target/src/asm/mod.rs

@@ -893,6 +893,7 @@ pub enum InlineAsmClobberAbi {
     RiscV,
     LoongArch,
     S390x,
+    Msp430,
 }
 
 impl InlineAsmClobberAbi {
@@ -946,6 +947,10 @@ impl InlineAsmClobberAbi {
                 "C" | "system" => Ok(InlineAsmClobberAbi::S390x),
                 _ => Err(&["C", "system"]),
             },
+            InlineAsmArch::Msp430 => match name {
+                "C" | "system" => Ok(InlineAsmClobberAbi::Msp430),
+                _ => Err(&["C", "system"]),
+            },
             _ => Err(&[]),
         }
     }
@@ -1125,6 +1130,11 @@ impl InlineAsmClobberAbi {
                     a8, a9, a10, a11, a12, a13, a14, a15,
                 }
             },
+            InlineAsmClobberAbi::Msp430 => clobbered_regs! {
+                Msp430 Msp430InlineAsmReg {
+                    r11, r12, r13, r14, r15,
+                }
+            },
         }
     }
 }