[llvm] [NFC][PowerpC] Add testcases for locking down the xxeval instruction support for ternary operators (PR #141601)

[Lei Huang via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; Test file to verify the emission of Vector selection instructions when ternary operators are used.
+
+; RUN: llc -verify-machineinstrs -mcpu=pwr10 -mtriple=powerpc64le-unknown-unknown \
+; RUN:   -ppc-asm-full-reg-names --ppc-vsr-nums-as-vr < %s | FileCheck %s
+
+; RUN: llc -verify-machineinstrs -mcpu=pwr10 -mtriple=powerpc-ibm-aix-xcoff \
+; RUN:   -ppc-asm-full-reg-names --ppc-vsr-nums-as-vr < %s | FileCheck %s
+
+; RUN: llc -verify-machineinstrs -mcpu=pwr10 -mtriple=powerpc64-ibm-aix-xcoff \
+; RUN:   -ppc-asm-full-reg-names --ppc-vsr-nums-as-vr < %s | FileCheck %s
+
+; Function to test ternary(A, xor(B, C), and(B, C)) for <4 x i32>
+define dso_local <4 x i32> @ternary_A_xor_BC_and_BC_4x32(<4 x i1> %A, <4 x i32> %B, <4 x i32> %C) local_unnamed_addr #0 {
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lei137 wrote:

```suggestion
define <4 x i32> @ternary_A_xor_BC_and_BC_4x32(<4 x i1> %A, <4 x i32> %B, <4 x i32> %C) nounwind {
```

https://github.com/llvm/llvm-project/pull/141601