Remove MIPS support

runtime/vm/unit_test.h

Index: runtime/vm/unit_test.h
diff --git a/runtime/vm/unit_test.h b/runtime/vm/unit_test.h
index 44300b9f6f4efb8b91b40a671247cbaa2449d603..ec82650d40265b3ff504ac5c6b1f56b45080ff43 100644
--- a/runtime/vm/unit_test.h
+++ b/runtime/vm/unit_test.h
@@ -162,10 +162,8 @@
   }
 
 
-#if defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_MIPS) ||                   \
-    defined(TARGET_ARCH_ARM64)
-#if defined(HOST_ARCH_ARM) || defined(HOST_ARCH_MIPS) ||                       \
-    defined(HOST_ARCH_ARM64)
+#if defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_ARM64)
+#if defined(HOST_ARCH_ARM) || defined(HOST_ARCH_ARM64)
 // Running on actual ARM or MIPS hardware, execute code natively.
 #define EXECUTE_TEST_CODE_INT32(name, entry) reinterpret_cast<name>(entry)()
 #define EXECUTE_TEST_CODE_INT64(name, entry) reinterpret_cast<name>(entry)()
@@ -232,7 +230,7 @@
       Utils::Low32Bits(bit_cast<int64_t, double>(double_arg)),                 \
       Utils::High32Bits(bit_cast<int64_t, double>(double_arg)), 0, 0, false,   \
       true))
-#endif  // defined(HOST_ARCH_ARM) || defined(HOST_ARCH_MIPS)
+#endif  // defined(HOST_ARCH_ARM)
 #endif  // defined(TARGET_ARCH_{ARM, ARM64, MIPS})