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[WebAssembly] Add experimental multivalue calling ABI

Authored by tlively on Jan 17 2020, 6:28 PM.

Description

[WebAssembly] Add experimental multivalue calling ABI

Summary:
For now, this ABI simply expands all possible aggregate arguments and
returns all possible aggregates directly. This ABI will change rapidly
as we prototype and benchmark a new ABI that takes advantage of
multivalue return and possibly other changes from the MVP ABI.

Reviewers: aheejin, dschuff

Subscribers: sbc100, jgravelle-google, sunfish, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D72972