Add compilation support for loongarch64 arch

Configurations/10-main.conf

@@ -736,6 +736,13 @@ sub vms_info {
         shared_ldflag    => add("-mabi=64"),
         multilib         => "64",
     },
+    "linux64-loongarch64" => {
+        inherit_from     => [ "linux-generic64" ],
+        cflags           => add("-mabi=lp64"),
+        perlasm_scheme   => "64",
+        shared_ldflag    => add("-mabi=lp64"),
+        multilib         => "64",
+    },
 
     #### IA-32 targets...
     #### These two targets are a bit aged and are to be used on older Linux