Add TestObjCTypeQueryFromOtherCompileUnit.py to test that when stopped in the 'main.c'

compile unit, which has an external reference to symbols defined in foo.m, the type query:

    in this case, 'expression (NSArray*)array_token'

continues to work.

This test is to accompany http://llvm.org/viewvc/llvm-project?rev=131145&view=rev.

llvm-svn: 131154