[llvm] [PowerPC] Utilize `getReservedRegs` to find asm clobberable registers. (PR #99766)

[zhijian lin via llvm-commits]

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+; RUN: llc < %s -mtriple=powerpc-unknown-aix-xcoff -verify-machineinstrs \
+; RUN:     -mcpu=pwr7 -mattr=+altivec -O0 2>&1 | FileCheck %s
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diggerlin wrote:

do you need the option `-mcpu=pwr7 -mattr=+altivec -O0`

https://github.com/llvm/llvm-project/pull/99766