Revert of Version 5.0.71.10 (cherry-pick)

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 1d996ccc0142dd1f19e8898c06d81ca4328c71ca..8a71aacb0ba0c94a57b68d10a449a4a2a1e3ee2a 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -715,21 +715,13 @@
   // Never falls through to here.
 
   __ bind(&slow);
+  // Prepare for call to builtin. Push object pointers, a0 (lhs) first,
+  // a1 (rhs) second.
+  __ Push(lhs, rhs);
+  // Figure out which native to call and setup the arguments.
   if (cc == eq) {
-    {
-      FrameScope scope(masm, StackFrame::INTERNAL);
-      __ Push(lhs, rhs);
-      __ CallRuntime(strict() ? Runtime::kStrictEqual : Runtime::kEqual);
-    }
-    // Turn true into 0 and false into some non-zero value.
-    STATIC_ASSERT(EQUAL == 0);
-    __ LoadRoot(a0, Heap::kTrueValueRootIndex);
-    __ Ret(USE_DELAY_SLOT);
-    __ subu(v0, v0, a0);  // In delay slot.
+    __ TailCallRuntime(strict() ? Runtime::kStrictEquals : Runtime::kEquals);
   } else {
-    // Prepare for call to builtin. Push object pointers, a0 (lhs) first,
-    // a1 (rhs) second.
-    __ Push(lhs, rhs);
     int ncr;  // NaN compare result.
     if (cc == lt || cc == le) {
       ncr = GREATER;