Revert "Remove failure tag.".

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 86a23835d913c28375130464fdeb1894d4735ca9..871164eaefe6059f9ed700beb3dbbdca9d780078 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -216,6 +216,12 @@ const int kCodeAlignmentBits = 5;
 const intptr_t kCodeAlignment = 1 << kCodeAlignmentBits;
 const intptr_t kCodeAlignmentMask = kCodeAlignment - 1;
 
+// Tag information for Failure.
+// TODO(yangguo): remove this from space owner calculation.
+const int kFailureTag = 3;
+const int kFailureTagSize = 2;
+const intptr_t kFailureTagMask = (1 << kFailureTagSize) - 1;
+
 
 // Zap-value: The value used for zapping dead objects.
 // Should be a recognizable hex value tagged as a failure.
@@ -531,6 +537,9 @@ enum StateTag {
 #define HAS_SMI_TAG(value) \
   ((reinterpret_cast<intptr_t>(value) & kSmiTagMask) == kSmiTag)
 
+#define HAS_FAILURE_TAG(value) \
+  ((reinterpret_cast<intptr_t>(value) & kFailureTagMask) == kFailureTag)
+
 // OBJECT_POINTER_ALIGN returns the value aligned as a HeapObject pointer
 #define OBJECT_POINTER_ALIGN(value)                             \
   (((value) + kObjectAlignmentMask) & ~kObjectAlignmentMask)