Revert "[PEI] Simplify handling of targets with no phys regs. NFC"

This reverts commit ce30ab6e5598f3c24f59ad016dc9526bc9a1d450.

sanitizer-ppc64le-linux seems to segfault when testing the sanitizers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308581 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed