[llvm] [LiveIntervals] Ignore artificial regs when adding kill flags (PR #116963)

[Jay Foad via llvm-commits]

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@@ -659,3 +659,11 @@ bool MachineRegisterInfo::isReservedRegUnit(unsigned Unit) const {
   }
   return false;
 }
+
+bool MachineRegisterInfo::isArtificialRegUnit(unsigned Unit) const {
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jayfoad wrote:

The set of reserved registers can be changed per function compiled so that needs to live in MRI. The artificial regs are a static property of the target so it can go in TRI.

https://github.com/llvm/llvm-project/pull/116963