[llvm] [SystemZ] Add check for INIT_UNDEF in getInstSizeInBytes (PR #134661)

[Nikita Popov via llvm-commits]

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@@ -1409,6 +1409,7 @@ class MachineInstr
   }
   bool isKill() const { return getOpcode() == TargetOpcode::KILL; }
   bool isImplicitDef() const { return getOpcode()==TargetOpcode::IMPLICIT_DEF; }
+  bool isInitUndef() const { return getOpcode() == TargetOpcode::INIT_UNDEF; }
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nikic wrote:

I don't think this is common enough to warrant a dedicated accessor.

https://github.com/llvm/llvm-project/pull/134661