Add support for BSWAP intrinsic (dotnet/coreclr#18398)

Add support for BSWAP intrinsic (dotnet/coreclr#18398)

With this change, the JIT will recognize a call to BinaryPrimitives.ReverseEndianness and will emit a bswap instruction.
This logic is currently only hooked up for x86 and x64; ARM still uses fallback logic.
If the JIT can't emit a bswap instruction (for example, trying to emit a 64-bit bswap in a 32-bit process), it will fall back to a software implementation, so the APIs will work across all architectures.

Commit migrated from https://github.com/dotnet/coreclr/commit/f72025c8b6d8a4fc3b4e22e2a3b6e1afeaef15ff