Fixes golang/go#60409

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Change-Id: I9c944eca6117b1039f0c5287706cb447b75c8cbd
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On Linux, the last argument of pselect6 system call is **not** a
sigseg_t * pointer, but instead it is a structure of the form:

    struct {
        const sigset_t *ss;     /* Pointer to signal set */
        size_t          ss_len; /* Size (in bytes) of object pointed
    };

See man 2 pselect6.

Fixes #61251

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This adds a few additional ioctl numbers for performing various block
device operations.

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On macOS, the SysctlKinfoProcSlice() function may be used to fetch the contents of the process table. As the process table may grow between the first and second call to sysctl(), the second call may fail with ENOMEM. In that case we simply need to retry.

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The riscv_hwprobe system call was introduced in Linux 6.4 and allows
the caller to determine a number of interesting pieces of information
about the underlying RISC-V CPUs, e.g., which extensions they support
and whether they allow fast unaligned memory accesses.  For more information
please see:

https://docs.kernel.org/riscv/hwprobe.html

We also update linux/mksysnum.go to ensure that the generated syscall constants
written to the zsysnum_linux_*.go files are always sorted by their syscall numbers
in ascending order.

Updates golang/go#61416

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Updates golang/go#44343
Fixes golang/go#61723

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Add wrappers for sched_getattr(2) and sched_setattr(2), as well as
various SCHED_ values usable for these.

The kludge in linux/types.go is needed so we can include both
linux/sched/types.h (for struct sched_attr) and sched.h (for a few
defines from include/bits/cpu-set.h).

Unfortunately, they both define struct sched_param, thus the need to
mask one of the definitions.

Change-Id: I3e13cf49ccef7ae81a75d33826d18de84a52106d
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Added detection for x86 AMX,
including AMX-Tile, AMX-INT8 and AMX-BF16
instruction sets.

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The mkwinsyscall command has a hard limit of 15 on the
number of syscall arguments. Windows has several system
calls with more than 15 arguments, for example CreateFontPackage
has 18 arguments.

If the number of arguments is higher than 15 we use SyscallN.

Fixes golang/go#57914

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Same as CL 520275 did in package syscall.

For golang/go#31316

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….21.0 for all

Running `GOOS=linux GOARCH={amd64,arm64,loong64,mips64le,riscv64} ./mkall.sh`
produces no changes, as expected.

Update Loong64's cross toolchain to support for the ELF psABI v2.0 relocs [1].

Updates #58784.

[1]: https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html

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