Add more generic version of reloc info padding to ensure enough space for rel...

src/assembler.h

Index: src/assembler.h
===================================================================
--- src/assembler.h	(revision 6848)
+++ src/assembler.h	(working copy)
@@ -184,6 +184,14 @@
   // we do not normally record relocation info.
   static const char* kFillerCommentString;
 
+  // The size of a comment is equal to tree bytes for the extra tagged pc +
+  // the tag for the data, and kPointerSize for the actual pointer to the
+  // comment.
+  static const int kRelocCommentSize = 3 + kPointerSize;
+
+  // The maximum size for a call instruction including pc-jump.
+  static const int kMaxCallSize = 6;
+
   enum Mode {
     // Please note the order is important (see IsCodeTarget, IsGCRelocMode).
     CONSTRUCT_CALL,  // code target that is a call to a JavaScript constructor.