[llvm] [NFC] add a test case to test hoisting the xxspltib out of the loop (PR #127701)

[zhijian lin via llvm-commits]

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+;; Test hoisting `xxspltib` out the loop.
+
+; RUN: llc -verify-machineinstrs -mtriple powerpc64-ibm-aix-xcoff  \
+; RUN:   %s -o - 2>&1 | FileCheck  %s
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diggerlin wrote:

The problem exist in the AIX32, AIX64 and linux.

https://github.com/llvm/llvm-project/pull/127701