[turbofan] Enable tail calls for %_CallFunction.

src/compiler/mips64/code-generator-mips64.cc

Index: src/compiler/mips64/code-generator-mips64.cc
diff --git a/src/compiler/mips64/code-generator-mips64.cc b/src/compiler/mips64/code-generator-mips64.cc
index 534ebfb09e5da459388d612f33a4008f2bb62b74..b3f8088e55f1403308399881dce3a64723a8c4c0 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -399,10 +399,6 @@ void CodeGenerator::AssembleDeconstructActivationRecord() {
   int stack_slots = frame()->GetSpillSlotCount();
   if (descriptor->IsJSFunctionCall() || stack_slots > 0) {
     __ LeaveFrame(StackFrame::MANUAL);
-    int pop_count = descriptor->IsJSFunctionCall()
-                        ? static_cast<int>(descriptor->JSParameterCount())
-                        : 0;
-    __ Drop(pop_count);
   }
 }
 
@@ -1230,8 +1226,14 @@ void CodeGenerator::AssembleReturn() {
       __ Pop(ra, fp);
       int pop_count = descriptor->IsJSFunctionCall()
                           ? static_cast<int>(descriptor->JSParameterCount())
-                          : 0;
-      __ DropAndRet(pop_count);
+                          : (info()->IsStub()
+                                 ? info()->code_stub()->GetStackParameterCount()
+                                 : 0);
+      if (pop_count != 0) {
+        __ DropAndRet(pop_count);
+      } else {
+        __ Ret();
+      }
     }
   } else {
     __ Ret();