[llvm] [InlineAsm] Steal a bit to denote a register is spillable (PR #70738)

[Matt Arsenault via llvm-commits]

================
@@ -1792,6 +1792,12 @@ void MachineInstr::print(raw_ostream &OS, ModuleSlotTracker &MST,
       if (F.isUseOperandTiedToDef(TiedTo))
         OS << " tiedto:$" << TiedTo;
 
+      if ((F.isRegDefKind() || F.isRegDefEarlyClobberKind() ||
+           F.isRegUseKind()) &&
+          F.getRegMayBeFolded()) {
+        OS << " foldable";
----------------
arsenm wrote:

Does this require new MIR printer/parser support and corresponding tests?

https://github.com/llvm/llvm-project/pull/70738