MIPS: [turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

MIPS: [turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

Port 4436c2642a9b7adc9a1b68577ae9ca9a9a404c06

Original commit message:
This adds support for the double bits intrinsics to TurboFan, and is
a first step towards fast Math functions inlined into TurboFan code
or even compiled by themselves with TurboFan.

BUG=

Review URL: https://codereview.chromium.org/980073003

Cr-Commit-Position: refs/heads/master@{#27028}