MIPS[64]: Support for MSA instructions

src/base/cpu.h

Index: src/base/cpu.h
diff --git a/src/base/cpu.h b/src/base/cpu.h
index ef55b575598761fd2d1a04ecd650c7bc355d45a6..4b4becfa204937583622807d4ac2329d1e03c583 100644
--- a/src/base/cpu.h
+++ b/src/base/cpu.h
@@ -113,6 +113,7 @@ class V8_BASE_EXPORT CPU final {
 
   // mips features
   bool is_fp64_mode() const { return is_fp64_mode_; }
+  bool has_msa() const { return has_msa_; }
 
  private:
   char vendor_[13];
@@ -154,6 +155,7 @@ class V8_BASE_EXPORT CPU final {
   bool has_vfp3_d32_;
   bool is_fp64_mode_;
   bool has_non_stop_time_stamp_counter_;
+  bool has_msa_;
 };
 
 }  // namespace base