MIPS64: Fix PatchRelocatedValue with new li 64-bit value.
Merge remote-tracking branch 'origin/pl-mips64' into yy-dev-mips64
MIPS64: Remove all break_ and fix InstanceofStub/DoStoreNamedField/DoStoreKeyedFixedArray.
MIPS64: Add ddiv to simulator.

Some test like mjsunit/apply will call ddiv.
MIPS64: Representation fix for DoStoreKeyedFixedArray().

TEST: mjsunit/regress/external-and-normal-array-polymorphism
MIPS64: String length fixed in EnsureNotWhite().
MIPS64: Add a TODO.
MIPS64: Fix GetLeastBitsFromSmi and remove SmiTagCheckOverflow.
MIPS64: Regexp fix.

TEST: mjsunit/ascii-regexp-subject etc..
Merge slightly out of sync development branches.

Merge remote-tracking branch 'mrb/yy-dev-mips64' into pldev-02