Fix uninitialized variable recording how much regexp code

has been generated.
Review URL: http://codereview.chromium.org/7015040

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7888 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/heap.cc

@@ -127,6 +127,7 @@ Heap::Heap()
       global_gc_prologue_callback_(NULL),
       global_gc_epilogue_callback_(NULL),
       gc_safe_size_of_old_object_(NULL),
+      total_regexp_code_generated_(0),
       tracer_(NULL),
       young_survivors_after_last_gc_(0),
       high_survival_rate_period_length_(0),