[Target] Make key=arm_cpu --> key=arm_cpu,cpu on AArch64 (#13775)

* arm cpu is cpu

* init commit

* fix test

Author: AndrewZhaoLuo

src/target/parsers/aprofile.cc

@@ -134,15 +134,17 @@ static TargetFeatures GetFeatures(TargetJSON target) {
 }
 
 static Array<String> MergeKeys(Optional<Array<String>> existing_keys) {
-  const String kExtraKey = "arm_cpu";
+  const Array<String> kExtraKeys = {"arm_cpu", "cpu"};
 
   if (!existing_keys) {
-    return {kExtraKey};
+    return kExtraKeys;
   }
 
   Array<String> keys = existing_keys.value();
-  if (std::find(keys.begin(), keys.end(), kExtraKey) == keys.end()) {
-    keys.push_back(kExtraKey);
+  for (String key : kExtraKeys) {
+    if (std::find(keys.begin(), keys.end(), key) == keys.end()) {
+      keys.push_back(key);
+    }
   }
   return keys;
 }

tests/cpp/target/parsers/aprofile_test.cc

@@ -48,8 +48,9 @@ static TargetFeatures ParseTargetWithAttrs(String mcpu, String mtriple, Array<St
 TEST(AProfileParser, ParseTargetKeys) {
   TargetJSON target = ParseTarget({});
   Array<String> keys = Downcast<Array<String>>(target.at("keys"));
-  ASSERT_EQ(keys.size(), 1);
+  ASSERT_EQ(keys.size(), 2);
   ASSERT_EQ(keys[0], "arm_cpu");
+  ASSERT_EQ(keys[1], "cpu");
 }
 
 TEST(AProfileParser, ParseTargetWithExistingKeys) {