Remove CFI workarounds after bumping mimimum Xcode version to 26
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Description
Just posting this for tracking. In https://github.com/dotnet/runtime/pull/114982#discussion_r2083272768 we discussed an issue with Apple linker that needed a workaround by placing .cfi_startproc/.cfi_endproc around .alt_entry labels. The bug has been fixed in Xcode 26 (as of Beta 6, but possibly earlier) and I verified that it's now working as expected.
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