[compiler-rt] Support building runtimes for Windows on arm32 (#101462) In these environments, the architecture name is armv7; recognize that and enable the relevant runtimes. Fix building the sanitizer_common library for this target, by using the right registers for the architecture - this is similar to what 0c391133c9201ef29273554a1505ef855ce17668 did for aarch64. (Still, address sanitizer doesn't support hooking functions at runtime on armv7 or aarch64 - but other runtimes such as ubsan do work.)
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