[asm.js] [wasm] Move asm->wasm + WebAssembly switches to features.
Moving asm->wasm and webassembly to a feature will make them
ready to control from a Finch trial with kill-switch.
NOTE: This will mean --enable-wasm will be replaced with:
--enable-features=WebAssembly
and --enable-asm-wasm will be replaced with:
--enable-features=AsmJsToWebAssembly
BUG= https://bugs.chromium.org/p/v8/issues/detail?id=4203
R=asvitkine@chromium.org,jam@chromium.org,titzer@chromium.org,mtrofin@chromium.org
Review-Url: https://codereview.chromium.org/2400823002
Cr-Commit-Position: refs/heads/master@{#424193}
12 files changed
