Log Message:
devel/binaryen: import binaryen-99.

Binaryen is a compiler and toolchain infrastructure library for WebAssembly,
written in C++. It aims to make compiling to WebAssembly easy, fast, and
effective.

* Easy: Binaryen has a simple C API in a single header, and can also be used
  from JavaScript. It accepts input in WebAssembly-like form but also accepts
  a general control flow graph for compilers that prefer that.

* Fast: Binaryen's internal IR uses compact data structures and is designed
  for completely parallel codegen and optimization, using all available CPU
  cores. Binaryen's IR also compiles down to WebAssembly extremely easily and
  quickly because it is essentially a subset of WebAssembly.

* Effective: Binaryen's optimizer has many passes (see an overview later
  down) that can improve code size and speed. These optimizations aim to
  make Binaryen powerful enough to be used as a compiler backend by itself.
  One specific area of focus is on WebAssembly-specific optimizations (that
  general-purpose compilers might not do), which you can think of as wasm
  minification, similar to minification for JavaScript, CSS, etc., all of
  which are language-specific.