Several of the asm.js tests were disabled and wrong (mismatched number of args
on the stdlib functions).

Fixing issue around negation and float + doubles.

Renaming function for IsNegate to IsInvert (to reflect what it actually does).

Added tests for negate and invert.

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=4203
R=aseemgarg@chromium.org,jpp@chromium.org

Review-Url: https://codereview.chromium.org/2377903002
Cr-Commit-Position: refs/heads/master@{#39836}