[clang] Remove aarch64 logic from 32-bit ARM target info

This logic is effectively dead code as 64-bit triples will end up
creating 64-bit TargetInfo instances.

Author: majnemer

clang/lib/Basic/Targets/ARM.h

@@ -227,7 +227,7 @@ class LLVM_LIBRARY_VISIBILITY ARMTargetInfo : public TargetInfo {
   const char *getBFloat16Mangling() const override { return "u6__bf16"; };
 
   std::pair<unsigned, unsigned> hardwareInterferenceSizes() const override {
-    return std::make_pair(getTriple().isArch64Bit() ? 256 : 64, 64);
+    return std::make_pair(64, 64);
   }
 };