This makes sure that only the "asm-js.h" header is exposed to outside
the directory holding the asm.js validator. It ensures that internals
don't leak out of that component, unless they are explicitly exposed
through the defined interface.

R=clemensh@chromium.org
BUG=v8:6127

Change-Id: I7c41782254cfce102af8edf4356205cfca904e60
Reviewed-on: https://chromium-review.googlesource.com/496147Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45125}

This uses the common macro lists instead of duplicating the list of
available math functions and values in {AsmJs::IsStdlibValid}.

R=rossberg@chromium.org
BUG=v8:6127

Change-Id: Ic480d74bb0b5f0f425d1e601e5128fa6f466bea1
Reviewed-on: https://chromium-review.googlesource.com/481260Reviewed-by: Andreas Rossberg <rossberg@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44725}

Adding a custom lexer for asm.js parsing.
It takes advantage of a number of asm.js properties to simply things:
* Assumes 'use asm' is the only string.
* Does not handle unicode for now (tools don't emit it).
* Combines global + local string table with lexer.

R=marja@chromium.org,vogelheim@chromium.org,kschimpf@chromium.org

BUG=v8:4203
BUG=v8:6090

Review-Url: https://codereview.chromium.org/2751693002
Cr-Commit-Position: refs/heads/master@{#43874}