Restore string variable cache.
Resurrect code to use formatted printing instead of PrintVal
but leave it turned off for now.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@888 91177308-0d34-0410-b5e6-96231b3b80d8
at least what used to. I should disable method exit code completely because
it's broken (doesn't insert just post dominating values)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@881 91177308-0d34-0410-b5e6-96231b3b80d8