[scudo][standalone] Define hasHardwareCRC32 for other archs

[cryptoad]

Summary

The function was only defined for x86 and arm families, which ends
up being an issue for PPC in g3.

Define the function, simply returning false for "other"
architectures.

compiler-rt/lib/scudo/standalone/checksum.cpp

const bool IsIntel = (Ebx == signature_INTEL_ebx) &&
                        (Ecx == signature_INTEL_ecx);
   const bool IsAMD = (Ebx == signature_AMD_ebx) && (Edx == signature_AMD_edx) &&
                      (Ecx == signature_AMD_ecx);
   if (!IsIntel && !IsAMD)
     return false;
   __get_cpuid(1, &Eax, &Ebx, &Ecx, &Edx);
   return !!(Ecx & bit_SSE4_2);
 }
-
 #elif defined(__arm__) || defined(__aarch64__)
 #ifndef AT_HWCAP
 #define AT_HWCAP 16
 #endif
 #ifndef HWCAP_CRC32
 #define HWCAP_CRC32 (1U << 7) // HWCAP_CRC32 is missing on older platforms.
 #endif
 
 bool hasHardwareCRC32() {
 #if SCUDO_FUCHSIA
   u32 HWCap;
   const zx_status_t Status =
       zx_system_get_features(ZX_FEATURE_KIND_CPU, &HWCap);
   if (Status != ZX_OK)
     return false;
   return !!(HWCap & ZX_ARM64_FEATURE_ISA_CRC32);
 #else
   return !!(getauxval(AT_HWCAP) & HWCAP_CRC32);
 #endif // SCUDO_FUCHSIA
 }
+#else
+// No hardware CRC32 implemented in Scudo for other architectures.
+bool hasHardwareCRC32() { return false; }
 #endif // defined(__x86_64__) || defined(__i386__)
 
 } // namespace scudo