[clang] [llvm] RFC: Implementing new mechanism for hard register operands to inline asm as a constraint. (PR #85846)

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic commented:

Please add tests for multiple constraints, like `void f() { asm(""::"i{x0}"(0)); }`.

https://github.com/llvm/llvm-project/pull/85846