[turbofan] Enable tail calls for %_CallFunction.

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

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index b9cc354b2321cd70d74670396661ce486ee8d923..2b605460787f8a2846b6bd8af58abc3c6e7ee69d 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -304,10 +304,6 @@ 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);
   }
 }
 
@@ -1053,8 +1049,12 @@ void CodeGenerator::AssembleReturn() {
       __ LeaveFrame(StackFrame::MANUAL);
       int pop_count = descriptor->IsJSFunctionCall()
                           ? static_cast<int>(descriptor->JSParameterCount())
-                          : 0;
-      __ Drop(pop_count);
+                          : (info()->IsStub()
+                                 ? info()->code_stub()->GetStackParameterCount()
+                                 : 0);
+      if (pop_count != 0) {
+        __ Drop(pop_count);
+      }
       __ Ret();
     }
   } else {