[llvm] [PowerPC] Add test after #75271 on PPC. NFC. (PR #75616)

[Kai Luo via llvm-commits]

================
@@ -0,0 +1,9039 @@
+# RUN: llc -mtriple=powerpc64le-unknown-linux-gnu -verify-coalescing -run-pass=register-coalescer \
+# RUN:   -o - %s | FileCheck %s
+--- |
----------------
bzEq wrote:

Thanks @arsenm , most of the 5000+ lines are virtregs, I've removed them.

https://github.com/llvm/llvm-project/pull/75616