[llvm-branch-commits] [CodeGen] Prevent register coalescer rematerialization based on target (PR #148430)

[Tomer Shafir via llvm-branch-commits]

================
@@ -1400,6 +1403,12 @@ bool RegisterCoalescer::reMaterializeTrivialDef(const 
CoalescerPair &CP,
   if (!Edit.canRematerializeAt(RM, ValNo, CopyIdx))
     return false;
 
+  if (!TII->shouldReMaterializeTrivialRegDef(CopyMI, DstReg, SrcReg)) {
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tomershafir wrote:

The API and its impl appear in the prev patch of the series: 
https://github.com/llvm/llvm-project/pull/148429
I designed the API lazily based on use, but will add function and LiveIntervals 
in the other patch

https://github.com/llvm/llvm-project/pull/148430
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