Remove remaining MIPS support.

With the exception of dwarf support in libelffile.

Test: aosp_taimen-userdebug boots.
Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 147346243
Change-Id: Ib25acbc98aa7f63ce49a7ed2f81a4a64d48eac39
25 files changed