Revert of SkSL performance improvements

src/sksl/ir/SkSLBlock.h

Index: src/sksl/ir/SkSLBlock.h
diff --git a/src/sksl/ir/SkSLBlock.h b/src/sksl/ir/SkSLBlock.h
index a53d13d1690934dd83853f07c1091304e71fd723..56ed77a0ba80ea644ad6183d9a42a813b3508d43 100644
--- a/src/sksl/ir/SkSLBlock.h
+++ b/src/sksl/ir/SkSLBlock.h
@@ -9,7 +9,6 @@
 #define SKSL_BLOCK
 
 #include "SkSLStatement.h"
-#include "SkSLSymbolTable.h"
 
 namespace SkSL {
 
@@ -17,11 +16,9 @@
  * 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 = "{";
@@ -34,7 +31,6 @@
     }
 
     const std::vector<std::unique_ptr<Statement>> fStatements;
-    const std::shared_ptr<SymbolTable> fSymbols;
 
     typedef Statement INHERITED;
 };