[x86][MC] Fix movdir64b addressing

This patch is to fix the [[ https://github.com/llvm/llvm-project/issues/63045 | issue 63045]].

Look at the following code:
```
int main(int argc, char *argv[]) {
    int arr[1000];
    __asm movdir64b rax, ZMMWORD PTR [arr]
    return 0;
}
```
Compiling this code using `clang -O0 -fasm-blocks bug.c` gives the a linker error.

The problem seems to be in the generated assembly. Following is the out put of `clang -S -O0 -fasm-blocks bug.c`:
```
movq %rsi, -16(%rbp)
#APP

movdir64b arr, %rax

#NO_APP
xorl %eax, %eax
```
The symbol `arr` should be replaced with some address like `-4(%rbp)`.

This makes me believe that issue is not in the linker, but with the ASM parser.

This issue originates with patch [D145893](https://reviews.llvm.org/D145893). And that's why reverting it fixes the issue. More specifically, the function [isMem512_GR64()](https://github.com/llvm/llvm-project/blob/ff471dcf7669b1ad7903a44d0773bef4eb175eb9/llvm/lib/Target/X86/AsmParser/X86Operand.h#L404) within the [llvm/lib/Target/X86/AsmParser/X86Operand.h](https://github.com/llvm/llvm-project/blob/main/llvm/lib/Target/X86/AsmParser/X86Operand.h) file.

Reviewed By: skan

Differential Revision: https://reviews.llvm.org/D151863