[wasm] Binary 11: Bump module version to 0xB. [wasm] Binary 11: Swap the order of section name / section length. [wasm] Binary 11: Shorter section names. [wasm] Binary 11: Add a prefix for function type declarations. [wasm] Binary 11: Function types encoded as pcount, p*, rcount, r* [wasm] Fix numeric names for functions (Chromium issue 575167).

[wasm] Binary 11: WASM AST is now postorder. [wasm] Binary 11: br_table takes a value. [wasm] Binary 11: Add implicit blocks to if arms. [wasm] Binary 11: Add arities to call, return, and breaks [wasm] Binary 11: Add experimental version (Chromium issue 575167).

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/5.2.175@{#1}
Cr-Branched-From: ee03b7217b040a0f51c41c59a6b861979eefac89-refs/heads/master@{#35897}