Support ctr and lr as clobber-only registers in PowerPC inline assembly

Author: taiki-e

src/asm.rs

@@ -698,8 +698,12 @@ fn reg_class_to_gcc(reg_class: InlineAsmRegClass) -> &'static str {
         InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::reg_nonzero) => "b",
         InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::freg) => "f",
         InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::vreg) => "v",
-        InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::cr)
-        | InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::xer) => {
+        InlineAsmRegClass::PowerPC(
+            PowerPCInlineAsmRegClass::cr
+            | PowerPCInlineAsmRegClass::ctr
+            | PowerPCInlineAsmRegClass::lr
+            | PowerPCInlineAsmRegClass::xer,
+        ) => {
             unreachable!("clobber-only")
         }
         InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::reg) => "r",
@@ -777,8 +781,12 @@ fn dummy_output_type<'gcc, 'tcx>(cx: &CodegenCx<'gcc, 'tcx>, reg: InlineAsmRegCl
         InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::vreg) => {
             cx.type_vector(cx.type_i32(), 4)
         }
-        InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::cr)
-        | InlineAsmRegClass::PowerPC(PowerPCInlineAsmRegClass::xer) => {
+        InlineAsmRegClass::PowerPC(
+            PowerPCInlineAsmRegClass::cr
+            | PowerPCInlineAsmRegClass::ctr
+            | PowerPCInlineAsmRegClass::lr
+            | PowerPCInlineAsmRegClass::xer,
+        ) => {
             unreachable!("clobber-only")
         }
         InlineAsmRegClass::RiscV(RiscVInlineAsmRegClass::reg) => cx.type_i32(),