880: Remove usage of LZCNT and TZCNT from singlepass. r=nlewycky a=nlewycky
# Description
This PR removes usage of LZCNT and TZCNT in singlepass to work on machines that don't support them. Unlike other instructions that fail loudly when not supported, LZCNT and TZCNT silently change behaviour by falling back to BSR and BSF which may produce different answers. They were used in the I32Clz, I32Ctz, I64Clz and I64Ctz instructions. Fixes i32.wast and i64.wast test failures on our Mac buildbot.
As an alternative, we could detect presence of LZCNT and TZCNT at runtime, either by running them directly or by querying CPUID to detect whether the CPU claims support for these instructions. I decided against that because having multiple paths is more complicated, and we aren't concerned with runtime of singlepass code, as a rule.
Co-authored-by: Nick Lewycky <nick@wasmer.io>
Co-authored-by: nlewycky <nick@wasmer.io>
After a long time, the macros are easy to read, but not at first
glance. I hope this PR will improve the situation: Same syntax used
everywhere, more spaces…
876: Bump structopt from 0.3.2 to 0.3.3 r=Hywan a=dependabot-preview[bot]
Bumps [structopt](https://github.com/TeXitoi/structopt) from 0.3.2 to 0.3.3.
<details>
<summary>Changelog</summary>
*Sourced from [structopt's changelog](https://github.com/TeXitoi/structopt/blob/master/CHANGELOG.md).*
> # v0.3.3 (2019-10-10)
>
> * Add `from_flag` custom parser to create flags from non-bool types.
> Fixes [#185](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/185)
</details>
<details>
<summary>Commits</summary>
- [`2cb1fbf`](2cb1fbf679) v0.3.3
- [`fd2cc62`](fd2cc62b63) Add from_flag parser ([#271](https://github-redirect.dependabot.com/TeXitoi/structopt/issues/271))
- [`6a3fc8b`](6a3fc8bc79) Run ui tests only on stable
- [`8d86616`](8d86616957) Fix code formatting
- [`cf61ff1`](cf61ff1eaf) Fix nightly tests
- [`0c888e9`](0c888e962d) Fix clippy warnings
- [`1cae9fa`](1cae9fab4b) Suppress all clippy warnings
- [`c228c23`](c228c2399b) Fix version in docs (AGAIN)
- See full diff in [compare view](https://github.com/TeXitoi/structopt/compare/v0.3.2...v0.3.3)
</details>
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