Version 3.31.61 (based on d0a7ef938ad54e5df867f14c27cb88a20786e573)

ES6: Update unscopables to match spec (issue 3632).

ES6 computed property names (issue 3754).

More -fsanitize=vptr fixes (Chromium issue 441099).

[turbofan] Cache conversions inserted during typed lowering (issue 3763).

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/candidates@{#25336}