[llvm] Update callers of isTriviallyReMaterializable to check trivialness (PR #160319)

[Matt Arsenault via llvm-commits]

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@@ -260,7 +260,10 @@ static void query(const MachineInstr &MI, bool &Read, bool &Write,
 // Test whether Def is safe and profitable to rematerialize.
 static bool shouldRematerialize(const MachineInstr &Def,
                                 const WebAssemblyInstrInfo *TII) {
-  return Def.isAsCheapAsAMove() && TII->isTriviallyReMaterializable(Def);
+  return Def.isAsCheapAsAMove() && TII->isTriviallyReMaterializable(Def) &&
+         llvm::all_of(Def.all_uses(), [](const MachineOperand &MO) {
+           return MO.getReg().isVirtual();
+         });
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arsenm wrote:

Should put this in a utility function somewhere 

https://github.com/llvm/llvm-project/pull/160319