[clang] [llvm] [X86] Support EGPR for inline assembly. (PR #92338)

[Freddy Ye via cfe-commits]

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FreddyLeaf wrote:

[4d1ad30](https://github.com/llvm/llvm-project/pull/92338/commits/4d1ad3090416cda320c88f1ddc0937b5749e64b4) moved but not merged. These two constraints will behavior different under -mattr=+egpr.

https://github.com/llvm/llvm-project/pull/92338