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* Generalise NaN handling and make std.math.nan() give quiet NaNs
* Address uses of std.math.qnan_* and std.math.nan_* consts
* Comment out failing test due to issues with signalling NaN
* Fix issue in c_builtins.zig where we need qnan_u32
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Most of this migration was performed automatically with `zig fmt`. There
were a few exceptions which I had to manually fix:
* `@alignCast` and `@addrSpaceCast` cannot be automatically rewritten
* `@truncate`'s fixup is incorrect for vectors
* Test cases are not formatted, and their error locations change
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Closes #12519
Closes #12505
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* 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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These functions semantically benefit from being inline; it makes sense
that `isInf(x)` where `x` is comptime-known should have a
comptime-known result.
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