Estimate a (close) upper bound on the size of black-marked objects on each page.

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index 7b40927cce344264c6a5c3621b762f6aa1cf5a74..1615a86ec951a2637e1b380df76120851f2159b3 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -707,6 +707,13 @@ void Assembler::add(Register dst, const Operand& src) {
 }
 
 
+void Assembler::add(const Operand& dst, Register src) {
+  EnsureSpace ensure_space(this);
+  EMIT(0x01);
+  emit_operand(src, dst);
+}
+
+
 void Assembler::add(const Operand& dst, const Immediate& x) {
   ASSERT(reloc_info_writer.last_pc() != NULL);
   EnsureSpace ensure_space(this);