Add support to lower the %_DebugIsActive intrinsic during
JSIntrinsicLowering instead of always going to the runtime
for this.

This addresses part of the Bluebird regression caused by
sending let and const to TurboFan and Ignition.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2550043002
Cr-Commit-Position: refs/heads/master@{#41468}