[llvm] Add Instruction selection support for x87 ld/st (PR #97016)

[Matt Arsenault via llvm-commits]

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@@ -611,7 +626,10 @@ bool X86InstructionSelector::selectLoadStoreOp(MachineInstr &I,
     I.removeOperand(0);
     addFullAddress(MIB, AM).addUse(DefReg);
   }
-  return constrainSelectedInstRegOperands(I, TII, TRI, RBI);
+  bool Constrained = constrainSelectedInstRegOperands(I, TII, TRI, RBI);
+  if (Constrained)
+    I.addImplicitDefUseOperands(MF);
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arsenm wrote:

You could just unconditionally call this 

https://github.com/llvm/llvm-project/pull/97016