Revert of SkSL performance improvements

src/sksl/ir/SkSLBlock.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
  
 #ifndef SKSL_BLOCK
 #define SKSL_BLOCK
 
 #include "SkSLStatement.h"
-#include "SkSLSymbolTable.h"
 
 namespace SkSL {
 
 /**
  * A block of multiple statements functioning as a single statement.
  */
 struct Block : public Statement {
-    Block(Position position, std::vector<std::unique_ptr<Statement>> statements,
-          const std::shared_ptr<SymbolTable> symbols)
+    Block(Position position, std::vector<std::unique_ptr<Statement>> statements)
     : INHERITED(position, kBlock_Kind)
-    , fStatements(std::move(statements))
-    , fSymbols(std::move(symbols)) {}
+    , fStatements(std::move(statements)) {}
 
     std::string description() const override {
         std::string result = "{";
         for (size_t i = 0; i < fStatements.size(); i++) {
             result += "\n";
             result += fStatements[i]->description();
         }
         result += "\n}\n";
         return result;        
     }
 
     const std::vector<std::unique_ptr<Statement>> fStatements;
-    const std::shared_ptr<SymbolTable> fSymbols;
 
     typedef Statement INHERITED;
 };
 
 } // namespace
 
 #endif