Backport rust-lang/rust#134117 and allow only `<*T>::offset`-like "GEPs". #633

Job	Run time
Test (ubuntu-24.04)	55s
Test (windows-2022)	51s
Android (ubuntu-24.04, aarch64-linux-android)	55s
Test (macOS-latest)	52s
Compiletest (windows-2022)	47s
Compiletest (ubuntu-24.04)	54s
Compiletest (macOS-latest)	46s
Difftest (ubuntu-24.04)	55s
Difftest (windows-2022)	50s
Difftest (macOS-latest)	51s
cargo-deny	52s
Lint	55s
test_success	3s
	10m 26s

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