Before, we allocated one script per function per instance, and each
script referenced the wasm instance and the function index. Now we only
allocate one script per compiled wasm module, so the script also only
references this WasmCompiledModule, which causes changes to many interfaces.

Instead of fixing the disassemble API only used via debug.js, I decided
to drop it for now. Some later CL will reintroduce it via
DebugInterface.

BUG=v8:5530,chromium:659715
R=yangguo@chromium.org, titzer@chromium.org
CC=jgruber@chromium.org

Review-Url: https://codereview.chromium.org/2493823003
Cr-Commit-Position: refs/heads/master@{#41004}