Revert of Remove SIMD.js from V8.

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index 18b9703046d095e0ca047abd5b686dd1bd56453f..303dcd53eea1f6c87d3b7f43ef2adcb49d74ccc5 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -233,6 +233,8 @@
     __ Branch(slow, greater, t0, Operand(FIRST_JS_RECEIVER_TYPE));
     // Call runtime on identical symbols since we need to throw a TypeError.
     __ Branch(slow, eq, t0, Operand(SYMBOL_TYPE));
+    // Call runtime on identical SIMD values since we must throw a TypeError.
+    __ Branch(slow, eq, t0, Operand(SIMD128_VALUE_TYPE));
   } else {
     __ Branch(&heap_number, eq, t0, Operand(HEAP_NUMBER_TYPE));
     // Comparing JS objects with <=, >= is complicated.
@@ -240,6 +242,8 @@
       __ Branch(slow, greater, t0, Operand(FIRST_JS_RECEIVER_TYPE));
       // Call runtime on identical symbols since we need to throw a TypeError.
       __ Branch(slow, eq, t0, Operand(SYMBOL_TYPE));
+      // Call runtime on identical SIMD values since we must throw a TypeError.
+      __ Branch(slow, eq, t0, Operand(SIMD128_VALUE_TYPE));
       // Normally here we fall through to return_equal, but undefined is
       // special: (undefined == undefined) == true, but
       // (undefined <= undefined) == false!  See ECMAScript 11.8.5.