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This commit renames the `is_target_feature_detected!` macro to have different names depending on the platform. For example: * `is_x86_feature_detected!` * `is_arm_feature_detected!` * `is_aarch64_feature_detected!` * `is_powerpc64_feature_detected!` Each macro already has a platform-specific albeit similar interface. Currently, though, each macro takes a different set of strings so the hope is that like with the name of the architecture in the module we can signal the dangers of using the macro in a platform-agnostic context. One liberty taken with the macro currently though is to on both the x86 and x86_64 architectures name the macro `is_x86_feature_detected` rather than also having an `is_x86_64_feature_detected`. This mirrors, however, how all the intrinsics are named the same on x86/x86_64.