Merge up to 8597 to experimental/gc from the bleeding edge.

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
===================================================================
--- src/ia32/assembler-ia32.cc	(revision 8618)
+++ src/ia32/assembler-ia32.cc	(working copy)
@@ -462,6 +462,13 @@
 }
 
 
+void Assembler::push(Handle<Object> handle) {
+  EnsureSpace ensure_space(this);
+  EMIT(0x68);
+  emit(handle);
+}
+
+
 void Assembler::pop(Register dst) {
   ASSERT(reloc_info_writer.last_pc() != NULL);
   EnsureSpace ensure_space(this);