[AMDGPU] Remove explicit datalayout from tests where not needed Since e39f6c1844fab59c638d8059a6cf139adb42279a opt will infer the correct datalayout when given a triple. Avoid explicitly specifying it in tests that depend on the AMDGPU target being present to avoid the string becoming out of sync with the TargetInfo value. Only tests with REQUIRES: amdgpu-registered-target or a local lit.cfg were updated to ensure that tests for non-target-specific passes that happen to use the AMDGPU layout still pass when building with a limited set of targets. Reviewed By: shiltian, arsenm Pull Request: https://github.com/llvm/llvm-project/pull/137921
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