LoongArch: Run overflow testcases only on LoongArch target

ld/testsuite/ld-loongarch-elf/ld-loongarch-elf.exp

@@ -133,18 +133,19 @@ if [istarget "loongarch64-*-*"] {
     run_dump_test "desc-norelax"
     run_dump_test "desc-relax"
   }
+
+  run_dump_test "max_imm_b16"
+  run_dump_test "max_imm_b21"
+  run_dump_test "max_imm_b26"
+  run_dump_test "max_imm_pcrel20"
+  run_dump_test "overflow_b16"
+  run_dump_test "overflow_b21"
+  run_dump_test "overflow_b26"
+  run_dump_test "overflow_pcrel20"
+  run_dump_test "underflow_b16"
+  run_dump_test "underflow_b21"
+  run_dump_test "underflow_b26"
+  run_dump_test "underflow_pcrel20"
+  run_dump_test "pie_discard"
 }
 
-run_dump_test "max_imm_b16"
-run_dump_test "max_imm_b21"
-run_dump_test "max_imm_b26"
-run_dump_test "max_imm_pcrel20"
-run_dump_test "overflow_b16"
-run_dump_test "overflow_b21"
-run_dump_test "overflow_b26"
-run_dump_test "overflow_pcrel20"
-run_dump_test "underflow_b16"
-run_dump_test "underflow_b21"
-run_dump_test "underflow_b26"
-run_dump_test "underflow_pcrel20"
-run_dump_test "pie_discard"