Fix potential overwriting of debug jumps of following code.

src/safepoint-table.h

Index: src/safepoint-table.h
diff --git a/src/safepoint-table.h b/src/safepoint-table.h
index fa3590511e97af8ffbcdb8436520814ed53e0f4e..54d2d6778e7a9406b97b2a1c665d41ef9ff4612c 100644
--- a/src/safepoint-table.h
+++ b/src/safepoint-table.h
@@ -221,8 +221,8 @@ class SafepointTableBuilder BASE_EMBEDDED {
       int arguments,
       int deoptimization_index = Safepoint::kNoDeoptimizationIndex);
 
-  // Update the last safepoint with the size of the code generated for the gap
-  // following it.
+  // Update the last safepoint with the size of the code generated until the
+  // end of the gap following it.
   void SetPcAfterGap(int pc) {
     ASSERT(!deoptimization_info_.is_empty());
     int index = deoptimization_info_.length() - 1;
@@ -233,6 +233,11 @@ class SafepointTableBuilder BASE_EMBEDDED {
   // entry must be enough to hold all the pointer indexes.
   void Emit(Assembler* assembler, int bits_per_entry);
 
+  // Count the number of deoptimization points where the next
+  // following deoptimization point comes less than limit bytes
+  // after the end of this point's gap.
+  int CountShortDeoptimizationIntervals(unsigned limit);
+
  private:
   struct DeoptimizationInfo {
     unsigned pc;
@@ -248,8 +253,8 @@ class SafepointTableBuilder BASE_EMBEDDED {
   ZoneList<ZoneList<int>*> indexes_;
   ZoneList<ZoneList<int>*> registers_;
 
-  bool emitted_;
   unsigned offset_;
+  bool emitted_;
 
   DISALLOW_COPY_AND_ASSIGN(SafepointTableBuilder);
 };