[MCJIT] Make the RuntimeDyldChecker stub_addr builtin use file names rather than

[MCJIT] Make the RuntimeDyldChecker stub_addr builtin use file names rather than
full paths for its first argument.

This allows us to remove the annoying sed lines in the test cases, and write
direct references to file names in stub_addr calls (rather than <filename>
placeholders).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214211 91177308-0d34-0410-b5e6-96231b3b80d8