This is a series of modifications about MIPS. Support src/readelf, strip, elflint, objdump related tools. Pass all previous test cases that failed due to MIPS non-support. The following are the test results on mips64el. # TOTAL: 271 # PASS: 263 # SKIP: 8 # XFAIL: 0 # FAIL: 0 # XPASS: 0 # ERROR: 0