MIPS: Split AST Declaration class, in preparation for new module declaration forms.

Port r10662 (c8054f6).

Original commit message:

Turns Declaration into an abstract class, and introduces VariableDeclaration as a concrete subclass.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9395015

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10709 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/full-codegen-mips.cc

@@ -295,11 +295,11 @@ void FullCodeGenerator::Generate(CompilationInfo* info) {
       // For named function expressions, declare the function name as a
       // constant.
       if (scope()->is_function_scope() && scope()->function() != NULL) {
-        int ignored = 0;
         VariableProxy* proxy = scope()->function();
         ASSERT(proxy->var()->mode() == CONST ||
                proxy->var()->mode() == CONST_HARMONY);
-        EmitDeclaration(proxy, proxy->var()->mode(), NULL, &ignored);
+        ASSERT(proxy->var()->location() != Variable::UNALLOCATED);
+        EmitDeclaration(proxy, proxy->var()->mode(), NULL);
       }
       VisitDeclarations(scope()->declarations());
     }
@@ -738,8 +738,7 @@ void FullCodeGenerator::PrepareForBailoutBeforeSplit(Expression* expr,
 
 void FullCodeGenerator::EmitDeclaration(VariableProxy* proxy,
                                         VariableMode mode,
-                                        FunctionLiteral* function,
-                                        int* global_count) {
+                                        FunctionLiteral* function) {
   // If it was not possible to allocate the variable at compile time, we
   // need to "declare" it at runtime to make sure it actually exists in the
   // local context.
@@ -748,7 +747,7 @@ void FullCodeGenerator::EmitDeclaration(VariableProxy* proxy,
       (mode == CONST || mode == CONST_HARMONY || mode == LET);
   switch (variable->location()) {
     case Variable::UNALLOCATED:
-      ++(*global_count);
+      ++global_count_;
       break;
 
     case Variable::PARAMETER:
@@ -836,9 +835,6 @@ void FullCodeGenerator::EmitDeclaration(VariableProxy* proxy,
 }
 
 
-void FullCodeGenerator::VisitDeclaration(Declaration* decl) { }
-
-
 void FullCodeGenerator::DeclareGlobals(Handle<FixedArray> pairs) {
   // Call the runtime to declare the globals.
   // The context is the first argument.