[llvm] [LiveVariables] Mark use as implicit-def if defined at instr (PR #119446)

[via llvm-commits]

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@@ -262,27 +250,11 @@ void LiveVariables::HandlePhysRegUse(Register Reg, MachineInstr &MI) {
     // ...
     //    = EAX
     // All of the sub-registers must have been defined before the use of Reg!
-    SmallSet<Register, 4> PartDefRegs;
-    MachineInstr *LastPartialDef = FindLastPartialDef(Reg, PartDefRegs);
+    MachineInstr *LastPartialDef = FindLastPartialDef(Reg);
     // If LastPartialDef is NULL, it must be using a livein register.
     if (LastPartialDef) {
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jofrn wrote:

Trying it out now. Last time there were some failures I believe.

https://github.com/llvm/llvm-project/pull/119446