[llvm] [X86] matchAddressRecursively - peek through ZEXT&shl&trunc to find indexreg = trunc's src (PR #73616)

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yubingex007-a11y wrote:

> @yubingex007-a11y Are you still seeing the regression after [0fac9da](https://github.com/llvm/llvm-project/commit/0fac9da7342e7846fbc4464abe5c00086cbf026c) ?

i am running internal benchmark now. need some time to see if the regression is gone

https://github.com/llvm/llvm-project/pull/73616