X64: Disabled RSet in 64-bit mode.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9f21211b84e1dcb7a840299c569cdd3cac13dce4..086c005b96ee6e137f48715a6cf254a591568ba9 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -296,12 +296,12 @@ enum PropertyNormalizationMode {
 // Since string types are not consecutive, this macro is used to
 // iterate over them.
 #define STRING_TYPE_LIST(V)                                                    \
-  V(SHORT_SYMBOL_TYPE, SeqTwoByteString::kHeaderSize, short_symbol)            \
-  V(MEDIUM_SYMBOL_TYPE, SeqTwoByteString::kHeaderSize, medium_symbol)          \
-  V(LONG_SYMBOL_TYPE, SeqTwoByteString::kHeaderSize, long_symbol)              \
-  V(SHORT_ASCII_SYMBOL_TYPE, SeqAsciiString::kHeaderSize, short_ascii_symbol)  \
-  V(MEDIUM_ASCII_SYMBOL_TYPE, SeqAsciiString::kHeaderSize, medium_ascii_symbol)\
-  V(LONG_ASCII_SYMBOL_TYPE, SeqAsciiString::kHeaderSize, long_ascii_symbol)    \
+  V(SHORT_SYMBOL_TYPE, SeqTwoByteString::kAlignedSize, short_symbol)            \
+  V(MEDIUM_SYMBOL_TYPE, SeqTwoByteString::kAlignedSize, medium_symbol)          \
+  V(LONG_SYMBOL_TYPE, SeqTwoByteString::kAlignedSize, long_symbol)              \
+  V(SHORT_ASCII_SYMBOL_TYPE, SeqAsciiString::kAlignedSize, short_ascii_symbol)  \
+  V(MEDIUM_ASCII_SYMBOL_TYPE, SeqAsciiString::kAlignedSize, medium_ascii_symbol)\
+  V(LONG_ASCII_SYMBOL_TYPE, SeqAsciiString::kAlignedSize, long_ascii_symbol)    \
   V(SHORT_CONS_SYMBOL_TYPE, ConsString::kSize, short_cons_symbol)              \
   V(MEDIUM_CONS_SYMBOL_TYPE, ConsString::kSize, medium_cons_symbol)            \
   V(LONG_CONS_SYMBOL_TYPE, ConsString::kSize, long_cons_symbol)                \
@@ -338,12 +338,12 @@ enum PropertyNormalizationMode {
   V(LONG_EXTERNAL_ASCII_SYMBOL_TYPE,                                           \
     ExternalAsciiString::kSize,                                                \
     long_external_ascii_symbol)                                                \
-  V(SHORT_STRING_TYPE, SeqTwoByteString::kHeaderSize, short_string)            \
-  V(MEDIUM_STRING_TYPE, SeqTwoByteString::kHeaderSize, medium_string)          \
-  V(LONG_STRING_TYPE, SeqTwoByteString::kHeaderSize, long_string)              \
-  V(SHORT_ASCII_STRING_TYPE, SeqAsciiString::kHeaderSize, short_ascii_string)  \
-  V(MEDIUM_ASCII_STRING_TYPE, SeqAsciiString::kHeaderSize, medium_ascii_string)\
-  V(LONG_ASCII_STRING_TYPE, SeqAsciiString::kHeaderSize, long_ascii_string)    \
+  V(SHORT_STRING_TYPE, SeqTwoByteString::kAlignedSize, short_string)            \
+  V(MEDIUM_STRING_TYPE, SeqTwoByteString::kAlignedSize, medium_string)          \
+  V(LONG_STRING_TYPE, SeqTwoByteString::kAlignedSize, long_string)              \
+  V(SHORT_ASCII_STRING_TYPE, SeqAsciiString::kAlignedSize, short_ascii_string)  \
+  V(MEDIUM_ASCII_STRING_TYPE, SeqAsciiString::kAlignedSize, medium_ascii_string)\
+  V(LONG_ASCII_STRING_TYPE, SeqAsciiString::kAlignedSize, long_ascii_string)    \
   V(SHORT_CONS_STRING_TYPE, ConsString::kSize, short_cons_string)              \
   V(MEDIUM_CONS_STRING_TYPE, ConsString::kSize, medium_cons_string)            \
   V(LONG_CONS_STRING_TYPE, ConsString::kSize, long_cons_string)                \
@@ -1553,6 +1553,7 @@ class Array: public HeapObject {
   // Layout descriptor.
   static const int kLengthOffset = HeapObject::kHeaderSize;
   static const int kHeaderSize = kLengthOffset + kIntSize;
+  static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Array);
@@ -3373,6 +3374,7 @@ class String: public HeapObject {
   // Layout description.
   static const int kLengthOffset = HeapObject::kHeaderSize;
   static const int kSize = kLengthOffset + kIntSize;
+  // Notice: kSize is not pointer-size aligned if pointers are 64-bit.
 
   // Limits on sizes of different types of strings.
   static const int kMaxShortStringSize = 63;
@@ -3526,6 +3528,7 @@ class SeqAsciiString: public SeqString {
 
   // Layout description.
   static const int kHeaderSize = String::kSize;
+  static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize);
 
   // Support for StringInputBuffer.
   inline void SeqAsciiStringReadBlockIntoBuffer(ReadBlockBuffer* buffer,
@@ -3571,6 +3574,7 @@ class SeqTwoByteString: public SeqString {
 
   // Layout description.
   static const int kHeaderSize = String::kSize;
+  static const int kAlignedSize = POINTER_SIZE_ALIGN(kHeaderSize);
 
   // Support for StringInputBuffer.
   inline void SeqTwoByteStringReadBlockIntoBuffer(ReadBlockBuffer* buffer,