LLVM: implement signext/zeroext attributes #12098
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These functions semantically benefit from being inline; it makes sense that `isInf(x)` where `x` is comptime-known should have a comptime-known result.
For calling convention ABI purposes, integer attributes and return values need to have an LLVM attribute signext or zeroext added sometimes. This commit implements that logic. It also implements a proof-of-concept of moving the F16T type from being a compiler_rt hack to being how the compiler lowers f16 in functions that need to match certain calling conventions. Closes #12054
* Sema: implement comptime bitcast of f80 with integer-like types bitwise rather than taking a round trip through memory layout. * Type: introduce `isAbiInt`. * Value: comptime memory write of f80 writes 0 bytes for padding instead of leaving the memory uninitialized. * Value: floatReadFromMemory has a more general implementation, checking the endianness rather than checking for specific architectures. This fixes behavior test failures occurring on MIPS.
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For calling convention ABI purposes, integer attributes and return
values need to have an LLVM attribute signext or zeroext added
sometimes. This commit implements that logic.
It also implements a proof-of-concept of moving the F16T type from
being a compiler_rt hack to being how the compiler lowers f16 in
functions that need to match certain calling conventions.
Closes #12054