add technetium logos and fix cortex-a72 flag

arm/build/config/compiler/BUILD.gn

@@ -2364,10 +2364,12 @@ if (is_win) {
 
   if (current_cpu == "arm64") {
     common_optimize_on_cflags += [ "-march=armv8-a+simd", ]
-  }
-
-  if (is_raspi == true) {
-    common_optimize_on_cflags += [ "-mtune=cortex-a72", ]
+    if (is_raspi == true) {
+      common_optimize_on_cflags += [ "-mtune=cortex-a72", ]
+    }
+    if (is_mac) {
+      common_optimize_on_cflags += [ "-march=armv8.3-a+simd", ]
+    }
   }
 
   common_optimize_on_cflags += [
@@ -2376,6 +2378,9 @@ if (is_win) {
 
   if (current_cpu == "arm64") {
     common_optimize_on_ldflags += [ "-march=armv8-a+simd", ]
+    if (is_mac) {
+      common_optimize_on_ldflags += [ "-march=armv8.3-a+simd", ]
+    }
   }
 
   common_optimize_on_ldflags += [