Extend the maximum size map space...

src/globals.h

Index: src/globals.h
===================================================================
--- src/globals.h	(revision 3473)
+++ src/globals.h	(working copy)
@@ -145,6 +145,14 @@
 const intptr_t kPointerAlignment = (1 << kPointerSizeLog2);
 const intptr_t kPointerAlignmentMask = kPointerAlignment - 1;
 
+// Desired alignment for maps.
+#if V8_HOST_ARCH_64_BIT
+const intptr_t kMapAlignmentBits = kObjectAlignmentBits;
+#else
+const intptr_t kMapAlignmentBits = kObjectAlignmentBits + 3;
+#endif
+const intptr_t kMapAlignment = (1 << kMapAlignmentBits);
+const intptr_t kMapAlignmentMask = kMapAlignment - 1;
 
 // Tag information for Failure.
 const int kFailureTag = 3;
@@ -174,6 +182,11 @@
 #endif
 
 
+// Number of bits to represent the page size for paged spaces. The value of 13
+// gives 8K bytes per page.
+const int kPageSizeBits = 13;
+
+
 // Constants relevant to double precision floating point numbers.
 
 // Quiet NaNs have bits 51 to 62 set, possibly the sign bit, and no
@@ -450,6 +463,10 @@
 #define POINTER_SIZE_ALIGN(value)                               \
   (((value) + kPointerAlignmentMask) & ~kPointerAlignmentMask)
 
+// MAP_SIZE_ALIGN returns the value aligned as a map pointer.
+#define MAP_SIZE_ALIGN(value)                               \
+  (((value) + kMapAlignmentMask) & ~kMapAlignmentMask)
+
 // The expression OFFSET_OF(type, field) computes the byte-offset
 // of the specified field relative to the containing type. This
 // corresponds to 'offsetof' (in stddef.h), except that it doesn't