[llvm] [PowerPC] Spill non-volatile registers required for traceback table (PR #71115)

[Chen Zheng via llvm-commits]

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@@ -463,7 +463,7 @@ for.preheader:
 
 for.body:                                         ; preds = %entry, %for.body
   %i.03 = phi i32 [ %inc, %for.body ], [ 0, %for.preheader ]
-  tail call void asm "addi 14, 14, 1", "~{r14}"()
+  tail call void asm "addi 31, 14, 1", "~{r31}"()
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chenzheng1030 wrote:

OK, I see. PEI only inserts save/restore for non-volatile CSRs which have defs.

I agree, we can keep the `r14`

https://github.com/llvm/llvm-project/pull/71115