Rollup merge of #160911 - adamgemmell:dev/adagem01/remove-d32, r=Amanieu Remove d32 feature from 32-bit Arm targets Fixes https://github.com/rust-lang/rust/issues/159973 In https://github.com/rust-lang/rust/pull/149512/ I removed `-d32` from some specs, but since LLVM enables `neon` by default for v7 targets `d32` was left enabled while it should be optional on this target. For a similar reason `-d32` was removed from some armv6 targets and has been readded. This PR adds a test to ensure this specific instance does not happen again and has been tested locally on armv7-unknown-linux-gnueabihf, armv7a-none-eabihf and arm-unknown-linux-gnueabihf. It might be a good idea in general to have a test that runs `--print cfg` and captures the set of rust target features enabled to show when PRs change them, but most of these targets are not run in Rust's CI so it's out of scope for this issue. For reference, here is the manually-expanded LLVM features and their implications - necessary as these targets rely on a feature from LLVM that Rust doesn't yet expose: ``` vfp4 -> vfp3 + fp16 + vfp4d16 + vfp4sp vfp4d16 -> vfp3d16 + fp16 + fp64 + vfp4d16sp vfp4sp -> vfp3sp + fp16 + d32 + vfp4d16sp vfp4d16sp -> vfp3d16sp + fp16 vfp3 -> vfp2 + vfp3d16 + vfp3sp vfp3d16 -> vfp2 + fp64 + vfp3d16sp vfp3sp -> vfp2 + d32 + vfp3d16sp vfp3d16sp -> vfp2sp vfp2 -> vfp2sp + fp64 vfp2sp -> fpregs ```
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