Remove unused CodeRegion class and corresponding logging functions.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index 02ee6c6e9144a1b15645bf01fa8dd28aa9cd3e3f..0352a7015f806cee683467811e9227cbcfd2e393 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -341,22 +341,6 @@ class RelocIterator: public Malloced {
 };
 
 
-// A stack-allocated code region logs a name for the code generated
-// while the region is in effect.  This information is used by the
-// profiler to categorize ticks within generated code.
-class CodeRegion BASE_EMBEDDED {
- public:
-  inline CodeRegion(Assembler* assm, const char *name) : assm_(assm) {
-    LOG(BeginCodeRegionEvent(this, assm, name));
-  }
-  inline ~CodeRegion() {
-    LOG(EndCodeRegionEvent(this, assm_));
-  }
- private:
-  Assembler* assm_;
-};
-
-
 //------------------------------------------------------------------------------
 // External function