Make InToSpace/InFromSpace use the page header.

src/ia32/macro-assembler-ia32-inl.h

Index: src/ia32/macro-assembler-ia32-inl.h
diff --git a/src/ia32/macro-assembler-ia32-inl.h b/src/ia32/macro-assembler-ia32-inl.h
index fe207adaa8f0b21ba165b9984deadc9575656e3f..6caa06ed7500cbb313f0aa799147afe0548ecca0 100644
--- a/src/ia32/macro-assembler-ia32-inl.h
+++ b/src/ia32/macro-assembler-ia32-inl.h
@@ -58,6 +58,31 @@ void MacroAssembler::CheckPageFlag(
 
 
 template<typename LabelType>
+void MacroAssembler::InNewSpace(
+    Register object,
+    Register scratch,
+    Condition cc,
+    LabelType* condition_met) {
+  ASSERT(cc == equal || cc == not_equal);
+  if (scratch.is(object)) {
+    and_(scratch, Immediate(~Page::kPageAlignmentMask));
+  } else {
+    mov(scratch, Immediate(~Page::kPageAlignmentMask));
+    and_(scratch, Operand(object));
+  }
+  // Check that we can use a test_b.
+  ASSERT(MemoryChunk::IN_FROM_SPACE < 8);
+  ASSERT(MemoryChunk::IN_TO_SPACE < 8);
+  int mask = (1 << MemoryChunk::IN_FROM_SPACE)
+           | (1 << MemoryChunk::IN_TO_SPACE);
+  // If non-zero, the page belongs to new-space.
+  test_b(Operand(scratch, MemoryChunk::kFlagsOffset),
+         static_cast<uint8_t>(mask));
+  j(NegateCondition(cc), condition_met);
+}
+
+
+template<typename LabelType>
 void MacroAssembler::InOldSpaceIsBlack(Register object,
                                        Register scratch0,
                                        Register scratch1,