Deoptimizer support for hydrogen stubs that accept a variable number of arguments.

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index b1ffaea14d1241e2ee8301f9647ff5896745a8df..9e6a5dfbc4d249dbfda8b17b7b2cd456b0cfb5bd 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -84,7 +84,7 @@ static void InitializeArrayConstructorDescriptor(Isolate* isolate,
   // stack param count needs (constructor pointer, and single argument)
   descriptor->stack_parameter_count_ = &r0;
   descriptor->register_params_ = registers;
-  descriptor->extra_expression_stack_count_ = 1;
+  descriptor->function_mode_ = JS_FUNCTION_MODE;
   descriptor->deoptimization_handler_ =
       FUNCTION_ADDR(ArrayConstructor_StubFailure);
 }
@@ -7987,6 +7987,9 @@ void StubFailureTrampolineStub::Generate(MacroAssembler* masm) {
   int parameter_count_offset =
       StubFailureTrampolineFrame::kCallerStackParameterCountFrameOffset;
   __ ldr(r1, MemOperand(fp, parameter_count_offset));
+  if (function_mode_ == JS_FUNCTION_MODE) {
+    __ add(r1, r1, Operand(1));
+  }
   masm->LeaveFrame(StackFrame::STUB_FAILURE_TRAMPOLINE);
   __ mov(r1, Operand(r1, LSL, kPointerSizeLog2));
   __ add(sp, sp, r1);