added basic dataflow analysis to skslc

src/sksl/SkSLGLSLCodeGenerator.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_GLSLCODEGENERATOR
 #define SKSL_GLSLCODEGENERATOR
 
@@ skipping 17 matching lines @@
 #include "ir/SkSLFunctionCall.h"
 #include "ir/SkSLFunctionDeclaration.h"
 #include "ir/SkSLFunctionDefinition.h"
 #include "ir/SkSLPrefixExpression.h"
 #include "ir/SkSLPostfixExpression.h"
 #include "ir/SkSLProgramElement.h"
 #include "ir/SkSLReturnStatement.h"
 #include "ir/SkSLStatement.h"
 #include "ir/SkSLSwizzle.h"
 #include "ir/SkSLTernaryExpression.h"
-#include "ir/SkSLVarDeclaration.h"
-#include "ir/SkSLVarDeclarationStatement.h"
+#include "ir/SkSLVarDeclarations.h"
+#include "ir/SkSLVarDeclarationsStatement.h"
 #include "ir/SkSLVariableReference.h"
 #include "ir/SkSLWhileStatement.h"
 
 namespace SkSL {
 
 #define kLast_Capability SpvCapabilityMultiViewport
 
 struct GLCaps {
     int fVersion;
     enum {
@@ skipping 130 matching lines @@
     bool fAtLineStart;
     // Keeps track of which struct types we have written. Given that we are unlikely to ever write 
     // more than one or two structs per shader, a simple linear search will be faster than anything 
     // fancier.
     std::vector<const Type*> fWrittenStructs;
 };
 
 }
 
 #endif