runtime: allow crash() to raise SIGABRT on darwin/arm64

To avoid gigantic core dumps, the runtime avoids raising SIGABRT
on crashes on 64-bit Darwin systems. Mobile OS'es (probably) don't
generate huge core dumps, so to aid crash reporters, allow SIGABRT
on crashes on darwin/arm64.

Change-Id: I4a29608f400967d76f9bd0643fea22244c2da9df
Reviewed-on: https://go-review.googlesource.com/49770
Run-TryBot: Elias Naur <elias.naur@gmail.com>
Reviewed-by: Avelino <t@avelino.xxx>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/runtime/signal_unix.go

@@ -8,7 +8,6 @@ package runtime
 
 import (
 	"runtime/internal/atomic"
-	"runtime/internal/sys"
 	"unsafe"
 )
 
@@ -474,7 +473,7 @@ func crash() {
 		// this means the OS X core file will be >128 GB and even on a zippy
 		// workstation can take OS X well over an hour to write (uninterruptible).
 		// Save users from making that mistake.
-		if sys.PtrSize == 8 {
+		if GOARCH == "amd64" {
 			return
 		}
 	}