Revert "ValueMapper: Treat LocalAsMetadata more like function-local Values"

This reverts commit r265759, since even this limited version breaks some
bots:
  http://lab.llvm.org:8011/builders/clang-ppc64be-linux/builds/3311
  http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-autoconf/builds/17696

This also reverts r265761 "ValueMapper: Unduplicate
RF_NoModuleLevelChanges check, NFC", since I had trouble separating it
from r265759.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265765 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed