Eliminate the constant location used for literals in the AST....

src/location.h

Index: src/location.h
===================================================================
--- src/location.h	(revision 3133)
+++ src/location.h	(working copy)
@@ -37,14 +37,12 @@
  public:
   static Location Temporary() { return Location(TEMP); }
   static Location Nowhere() { return Location(NOWHERE); }
-  static Location Constant() { return Location(CONSTANT); }
 
   bool is_temporary() { return type_ == TEMP; }
   bool is_nowhere() { return type_ == NOWHERE; }
-  bool is_constant() { return type_ == CONSTANT; }
 
  private:
-  enum Type { TEMP, NOWHERE, CONSTANT };
+  enum Type { TEMP, NOWHERE };
 
   explicit Location(Type type) : type_(type) {}