Add __gnu_thumb1_case_{sqi,uqi,shi,uhi,si} to compiler_rt
#24806
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I copied the implementations from https://github.com/gcc-mirror/gcc/blob/f2a85db9eee7d761692ca8f69ea1a20d32715bad/libgcc/config/arm/lib1funcs.S (hopefully that isn’t some sort of copyright issue because I’m not sure how else you’d implement them) and wrapped them in naked functions. Not sure if I need something like
.thumb_func(or how to do that) or ifarch.isThumb()is correct.Fixes #24558.