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

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

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.

Review URL: https://codereview.chromium.org/974313002

Cr-Commit-Position: refs/heads/master@{#27006}