Revert of Reduced skslc memory consumption

src/sksl/ir/SkSLFunctionDeclaration.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_FUNCTIONDECLARATION
 #define SKSL_FUNCTIONDECLARATION
 
-#include "SkSLExpression.h"
 #include "SkSLModifiers.h"
 #include "SkSLSymbol.h"
 #include "SkSLSymbolTable.h"
 #include "SkSLType.h"
 #include "SkSLVariable.h"
 
 namespace SkSL {
 
 /**
  * A function declaration (not a definition -- does not contain a body).
@@ skipping 27 matching lines @@
             return false;
         }
         for (size_t i = 0; i < fParameters.size(); i++) {
             if (fParameters[i]->fType != f.fParameters[i]->fType) {
                 return false;
             }
         }
         return true;
     }
 
-    /**
-     * Determine the effective types of this function's parameters and return value when called with
-     * the given arguments. This is relevant for functions with generic parameter types, where this 
-     * will collapse the generic types down into specific concrete types.
-     *
-     * Returns true if it was able to select a concrete set of types for the generic function, false
-     * if there is no possible way this can match the argument types. Note that even a true return
-     * does not guarantee that the function can be successfully called with those arguments, merely
-     * indicates that an attempt should be made. If false is returned, the state of
-     * outParameterTypes and outReturnType are undefined.
-     */
-    bool determineFinalTypes(const std::vector<std::unique_ptr<Expression>>& arguments,
-                             std::vector<const Type*>* outParameterTypes,
-                             const Type** outReturnType) const {
-        assert(arguments.size() == fParameters.size());
-        int genericIndex = -1;
-        for (size_t i = 0; i < arguments.size(); i++) {
-            if (fParameters[i]->fType.kind() == Type::kGeneric_Kind) {
-                std::vector<const Type*> types = fParameters[i]->fType.coercibleTypes();
-                if (genericIndex == -1) {
-                    for (size_t j = 0; j < types.size(); j++) {
-                        if (arguments[i]->fType.canCoerceTo(*types[j])) {
-                            genericIndex = j;
-                            break;
-                        }
-                    }
-                    if (genericIndex == -1) {
-                        return false;
-                    }
-                }
-                outParameterTypes->push_back(types[genericIndex]);
-            } else {
-                outParameterTypes->push_back(&fParameters[i]->fType);
-            }
-        }
-        if (fReturnType.kind() == Type::kGeneric_Kind) {
-            assert(genericIndex != -1);
-            *outReturnType = fReturnType.coercibleTypes()[genericIndex];
-        } else {
-            *outReturnType = &fReturnType;
-        }
-        return true;
-    }
-
     mutable bool fDefined;
     bool fBuiltin;
     const std::vector<const Variable*> fParameters;
     const Type& fReturnType;
 
     typedef Symbol INHERITED;
 };
 
 } // namespace
 
 #endif