[ASan] Revert r168040 and r168043 and take a cleaner solution suggested by Kostya: return the known frame name for fake stack instead of looking it up.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@168046 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed