Merge r8390 from bleeding edge (fix missing write barrier in arguments IC).

src/arm/ic-arm.cc

Index: src/arm/ic-arm.cc
===================================================================
--- src/arm/ic-arm.cc	(revision 8390)
+++ src/arm/ic-arm.cc	(working copy)
@@ -996,12 +996,16 @@
   MemOperand mapped_location =
       GenerateMappedArgumentsLookup(masm, r2, r1, r3, r4, r5, &notin, &slow);
   __ str(r0, mapped_location);
+  __ add(r6, r3, r5);
+  __ RecordWrite(r3, r6, r9);
   __ Ret();
   __ bind(&notin);
   // The unmapped lookup expects that the parameter map is in r3.
   MemOperand unmapped_location =
       GenerateUnmappedArgumentsLookup(masm, r1, r3, r4, &slow);
   __ str(r0, unmapped_location);
+  __ add(r6, r3, r4);
+  __ RecordWrite(r3, r6, r9);
   __ Ret();
   __ bind(&slow);
   GenerateMiss(masm, false);