79c71d1f9e
ARM: Only allow using d16-d31 with asm! when supported by the target Support can be determined by checking for the "d32" LLVM feature. r? ```````````````@nagisa```````````````
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.