Upgrade to latest Zig

[Jarred-Sumner]

This is blocked on ziglang/zig#13017.

Posting this PR here so others can follow progress

[vjpr]

Just FYI

From: https://ziglang.org/news/goodbye-cpp/

Furthermore, this change represents the removal of the -fstage1 flag, which allowed users of Zig to opt out of the new compiler and use the old one. This was the only way to take advantage of async functions, an experimental language feature that is not yet implemented in the new compiler.

I recommend users of -fstage1 to stick with 0.10.0, and then upgrade to 0.10.1 when it is released, and then finally upgrade to 0.11.0, which will have async function support. Note that Zig follows Semantic Versioning and so everything described in this blog post will not be included in the 0.10.1 release, which will only contain bug fixes cherry-picked from master branch.

Zig 0.11.0 Github milestone = https://github.com/ziglang/zig/milestone/17

...Aiming for two weeks after LLVM 16.0.0 release...Due by May 29, 2023

[vjpr]

andrewrk — Today at 20:19
current development focus:
...

• fixing bugs in the compiler such as the one preventing Bun from updating to latest master branch due to the compiler crashing

...

https://discord.com/channels/605571803288698900/785499283368706060/1053028467517698048

[Jarred-Sumner]

Rebased against main after @Vexu's changes

Once ziglang/zig#14004 is merged, I'll give it another try

[Jarred-Sumner]

Current status: stuck on a confusing compiler error. It seems to think that a function that doesn't use try needs to return an error union type

error: expected error union type, found '?*bun.js.javascript_core_c_api.generic'
        return js.JSValueMakeUndefined(ctx);
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
referenced by:
    readFileAsBytes: src/bun.js/api/bun.zig:801:20
    Class: src/bun.js/api/bun.zig:1129:23
    remaining reference traces hidden; use '-freference-trace' to see all reference traces

/home/jarred/zig/0.11.0-dev.926+266e2e9a3/files/lib/std/mem.zig:3644:9: error: expected []T or *[_]T, passed error{OutOfMemory}![]i32
        @compileError("expected []T or *[_]T, passed " ++ @typeName(sliceType));
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/jarred/zig/0.11.0-dev.926+266e2e9a3/files/lib/std/mem.zig:3651:59: note: called from here
pub fn sliceAsBytes(slice: anytype) SliceAsBytesReturnType(@TypeOf(slice)) {