Add bitcode test to verify functions can be materialized out of order.

Summary:
Adds test to check that when getLazyBitcodeModule is called:
1) Functions are not materailzed by default.
2) Only the requested function gets materialized (if no block addresses
   are used).

Reviewers: jvoung, rafael

Reviewed By: rafael

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8907

llvm-svn: 236611