Revert "[SE-0368] StaticBigInt"

[etcwilde]

Reverts #40722

This caused the minimal toolchain build to fail: https://ci.swift.org/job/oss-swift-test-stdlib-with-toolchain-minimaln//3006

[etcwilde]

@swift-ci please smoke test

[benrimmington]

I don't understand the failure. Should files using the new builtins have #if compiler(>=5.8) guards?

[glessard]

A thought (and shot in the dark): the minimal toolchain does not have any of the 128-bit types. I had a failure on the minimal toolchain bot when I included a test of a SIMD type for loadUnaligned().

[etcwilde]

It's affecting the non-minimal standard library build too: https://ci.swift.org/job/oss-swift-test-stdlib-with-toolchain//3006

[benrimmington]

Looking at the build logs, the latest snapshot (2022-12-05) is being downloaded:

[Pipeline] sh
+ /usr/bin/curl --silent https://download.swift.org/development/xcode/latest-build.yml
[Pipeline] readYaml
[Pipeline] sh
+ /usr/bin/curl --silent https://download.swift.org/development/xcode/swift-DEVELOPMENT-SNAPSHOT-2022-12-05-a/swift-DEVELOPMENT-SNAPSHOT-2022-12-05-a-osx.pkg

So are these jobs using an older toolchain (which doesn't yet have the new builtins), and will this failure resolve itself?

[benrimmington]

The latest oss-swift-package-macos job was successful.

I'd like to wait for the 2022-12-06 snapshot, and then see if the other "stdlib-with-toolchain" jobs will succeed.

[benrimmington]

Both jobs are successfully building, when they download the 2022-12-07 snapshot:

• https://ci.swift.org/job/oss-swift-test-stdlib-with-toolchain/

• https://ci.swift.org/job/oss-swift-test-stdlib-with-toolchain-minimaln/

[rjmccall]

@benrimmington This is actually an instance of a general problem that we've come to call "condfails", and it does need to be fixed. Basically, it's important that we tolerate at least a little bit of version slop to allow old compilers to work with new SDKs. You don't have to make the functions actually work with the old compiler — it's not usually possible — but you do need to allow the module to compile. Generally you do this with #if compiler; here's an example.