[HIP] Fix ordering of device-libs linking

Summary:
HIP should link the bitcodes with caller functions before callee functions. Also added lit test to check the ordering of the linked bitcodes is matches.

Reviewers: yaxunl, b-sumner

Reviewed By: yaxunl, b-sumner

Subscribers: cfe-commits, yaxunl, b-sumner, scchan

Differential Revision: https://reviews.llvm.org/D48667

llvm-svn: 335774