[X86] Fix the implementation of __readcr[4,8]/__writecr[4,8] to work in 64-bit mode (#122238) According to MSVC, __readcr4/__writecr4 return/use `unsigned __int64`, and are supported on both x86 and x64. While __readcr8/__writecr8 are only supported on x64. So we use __INTPTR_TYPE__ and __int64 respectively. Following: https://github.com/llvm/llvm-project/commit/3cec2a17de744900401c83aedb442e2acc1f23f8 Ref.: https://learn.microsoft.com/en-us/cpp/intrinsics/readcr3?view=msvc-170 https://learn.microsoft.com/en-us/cpp/intrinsics/readcr8?view=msvc-170
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