Commits on Apr 22, 2020

1. Add AArch64 tests to CI …

   This commit enhances our CI with an AArch64 builder. Currently we have
   no physical hardware to run on so for now we run all tests in an
   emulator. The AArch64 build is cross-compiled from x86_64 from Linux.
   Tests all happen in release mode with a recent version of QEMU (recent
   version because it's so much faster, and in release mode because debug
   mode tests take quite a long time in an emulator).
   
   The goal here was not to get all tests passing on CI, but rather to get
   AArch64 running on CI and get it green at the same time. To achieve that
   goal many tests are now ignored on aarch64 platforms. Many tests fail
   due to unimplemented functionality in the aarch64 backend (bytecodealliance#1521), and
   all wasmtime tests involving compilation are also disabled due to
   panicking attempting to generate generate instruction offset information
   for trap symbolication (bytecodealliance#1523).
   
   Despite this, though, all Cranelift tests and other wasmtime tests
   should be runnin on AArch64 through QEMU with this PR. Additionally
   we'll have an AArch64 binary release of Wasmtime for Linux, although it
   won't be too useful just yet since it will panic on almost all wasm
   modules.

   

   alexcrichton committed Apr 22, 2020
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2. Review comments

   

   alexcrichton committed Apr 22, 2020
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