Add CPU detection for Ampere Siryn

PiperOrigin-RevId: 561444259
Change-Id: I205ba9f11f4d41163ce74ae9cfa417fe500ccab3

absl/crc/internal/cpu_detect.cc

@@ -246,6 +246,9 @@ CpuType GetCpuType() {
     if (implementer == 0x41 && part_number == 0xd0c) {
       return CpuType::kArmNeoverseN1;
     }
+    if (implementer == 0xc0 && part_number == 0xac3) {
+      return CpuType::kAmpereSiryn;
+    }
   }
   return CpuType::kUnknown;
 }

absl/crc/internal/cpu_detect.h

@@ -39,6 +39,7 @@ enum class CpuType {
   kIntelSandybridge,
   kIntelWestmere,
   kArmNeoverseN1,
+  kAmpereSiryn,
 };
 
 // Returns the type of host CPU this code is running on.  Returns kUnknown if