MIPS: Inline zero argument array constructor.

Port r17741 (fe14ef8)

Original commit message:
patch from issue 54583003 (dependent code).

Zero arguments - very easy

1 argument - three special cases:
a) If length is a constant in valid array length range,
no need to check it at runtime.
b) respect DoNotInline feedback on the AllocationSite for
cases that the argument is not a smi or is an integer
with a length that should create a dictionary.
c) if kind feedback is non-holey, and length is non-constant,
we'd have to generate a lot of code to be correct.
Don't inline this case.

N arguments - one special case:
a) If a deopt ever occurs because an input argument isn't
compatible with the elements kind, then set the
DoNotInline flag.

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/72893003

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17759 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/code-stubs-mips.cc

@@ -6005,11 +6005,14 @@ static void CreateArrayDispatchOneArgument(MacroAssembler* masm,
       __ lw(t1, FieldMemOperand(a2, Cell::kValueOffset));
     }
 
-    // Save the resulting elements kind in type info
-    __ SmiTag(a3);
-    __ lw(t1, FieldMemOperand(a2, Cell::kValueOffset));
-    __ sw(a3, FieldMemOperand(t1, AllocationSite::kTransitionInfoOffset));
-    __ SmiUntag(a3);
+    // Save the resulting elements kind in type info. We can't just store a3
+    // in the AllocationSite::transition_info field because elements kind is
+    // restricted to a portion of the field...upper bits need to be left alone.
+    STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
+    __ lw(t0, FieldMemOperand(t1, AllocationSite::kTransitionInfoOffset));
+    __ Addu(t0, t0, Operand(Smi::FromInt(kFastElementsKindPackedToHoley)));
+    __ sw(t0, FieldMemOperand(t1, AllocationSite::kTransitionInfoOffset));
+
 
     __ bind(&normal_sequence);
     int last_index = GetSequenceIndexFromFastElementsKind(
@@ -6151,6 +6154,8 @@ void ArrayConstructorStub::Generate(MacroAssembler* masm) {
 
   __ lw(a3, FieldMemOperand(a3, AllocationSite::kTransitionInfoOffset));
   __ SmiUntag(a3);
+  STATIC_ASSERT(AllocationSite::ElementsKindBits::kShift == 0);
+  __ And(a3, a3, Operand(AllocationSite::ElementsKindBits::kMask));
   GenerateDispatchToArrayStub(masm, DONT_OVERRIDE);
 
   __ bind(&no_info);

src/mips/stub-cache-mips.cc

@@ -1673,7 +1673,7 @@ Handle<Code> CallStubCompiler::CompileArrayCodeCall(
   }
 
   Handle<AllocationSite> site = isolate()->factory()->NewAllocationSite();
-  site->set_transition_info(Smi::FromInt(GetInitialFastElementsKind()));
+  site->SetElementsKind(GetInitialFastElementsKind());
   Handle<Cell> site_feedback_cell = isolate()->factory()->NewCell(site);
   __ li(a0, Operand(argc));
   __ li(a2, Operand(site_feedback_cell));