[mips] Lift the assertion on the types that can be used with MipsGPRel

[mips] Lift the assertion on the types that can be used with MipsGPRel

Post commit review of rL308619 highlighted the need for handling N64
with -fno-pic. Testing reveale a stale assert when generating a GP
relative addressing mode.

This patch removes that assert and adds the necessary patterns for
MIPS64 to perform gp relative addressing with -fno-pic
(and the implicit -mno-abicalls + -mgpopt).

Reviewers: atanasyan, nitesh.jain

Differential Revision: https://reviews.llvm.org/D36472

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310713 91177308-0d34-0410-b5e6-96231b3b80d8