Added the --all argument to "target modules lookup"

that forces all matches to be looked up.  When --all
is not passed, and the current execution frame can
be used to narrow down the search, "target modules
lookup" will try searching in that specific frame
first.  Only if nothing is turned up there will it
go on to search all modules.

This feature is currently enabled only for types.

llvm-svn: 158107