Add a single-element global positive and negative cache to...

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
===================================================================
--- src/arm/macro-assembler-arm.cc	(revision 4568)
+++ src/arm/macro-assembler-arm.cc	(working copy)
@@ -232,6 +232,13 @@
 }
 
 
+void MacroAssembler::StoreRoot(Register source,
+                               Heap::RootListIndex index,
+                               Condition cond) {
+  str(source, MemOperand(roots, index << kPointerSizeLog2), cond);
+}
+
+
 // Will clobber 4 registers: object, offset, scratch, ip.  The
 // register 'object' contains a heap object pointer.  The heap object
 // tag is shifted away.