X64: Changed 0x%x formats in log.cc to 0x%p and omitted reinterpretting pointers.

src/log.h

Index: src/log.h
diff --git a/src/log.h b/src/log.h
index a7c6604a178d2106e52325f326ec623a402870d6..5f3c188c5327eb90a791ca0ccd396cb8e41081b3 100644
--- a/src/log.h
+++ b/src/log.h
@@ -261,12 +261,12 @@ class Logger {
 // Class that extracts stack trace, used for profiling.
 class StackTracer BASE_EMBEDDED {
  public:
-  explicit StackTracer(unsigned int low_stack_bound)
+  explicit StackTracer(uintptr_t low_stack_bound)
       : low_stack_bound_(low_stack_bound) { }
   void Trace(TickSample* sample);
  private:
 
-  unsigned int low_stack_bound_;
+  uintptr_t low_stack_bound_;
 };