MIPS: Resolved the rest of soft-float bugs.

TEST=mjsunit/mul-exhaustive-part9, mjsunit/bit-not, mjsunit/greedy,
mjsunit/math-floor-of-div-nosudiv, mjsunit/math-floor-of-div,
mjsunit/numops-fuzz-part2

BUG=

Review URL: https://codereview.chromium.org/13455006
Patch from Dusan Milosavljevic <Dusan.Milosavljevic@rt-rk.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14145 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Pass an isolate to GetCurrent()

TEST=test-api.cc:GetCallingContextCallback

Review URL: https://chromiumcodereview.appspot.com//13426002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14146 ce2b1a6d-e550-0410-aec6-3dcde31c8c00