[MCP] Use MachineInstr::all_defs instead of MachineInstr::defs in hasOverlappingMultipleDef.

defs does not return the defs for inline assembly. We need to use
all_defs to find them.

Need to reduce a test case still.

Fixes #86880.

Author: topperc

llvm/lib/CodeGen/MachineCopyPropagation.cpp

@@ -640,7 +640,7 @@ bool MachineCopyPropagation::hasImplicitOverlap(const MachineInstr &MI,
 /// The umull instruction is unpredictable unless RdHi and RdLo are different.
 bool MachineCopyPropagation::hasOverlappingMultipleDef(
     const MachineInstr &MI, const MachineOperand &MODef, Register Def) {
-  for (const MachineOperand &MIDef : MI.defs()) {
+  for (const MachineOperand &MIDef : MI.all_defs()) {
     if ((&MIDef != &MODef) && MIDef.isReg() &&
         TRI->regsOverlap(Def, MIDef.getReg()))
       return true;