Let's a void any kind of compilation/LLVM errors for niche targets such
as AVR/MSP430 or ARM v6m. By not exporting any atomic builtin anymore
the user is free to provide their own implementation (that disable the
IRQs) or to provide the --single-threaded switch and forget about this.
It's needed because LLVM emits library calls to compiler-rt when hardware lacks
functionality, for example, 64-bit integer multiplication on 32-bit x86.
This library is automatically built as-needed for the compilation target and
then statically linked and therefore is a transparent dependency for the
programmer.
Any bugs should be solved by trying to duplicate the bug upstream.
If the bug exists upstream, get it fixed with the LLVM team and then port
the fix downstream to Zig.
If the bug only exists in Zig, something went wrong porting the code,
and you can run the C code and Zig code side by side in a debugger
to figure out what's happening differently.
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