[X86][AMX] Fix a bug after #83628 (#91207)
We need to check if `GR64Cand` a valid register before using it. Test is not needed since it's covered in llvm-test-suite. Fixes #90954
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We need to check if `GR64Cand` a valid register before using it. Test is not needed since it's covered in llvm-test-suite. Fixes #90954