[FIR2IR] Introduce own symbol implementations

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/symbols/Fir2IrSymbols.kt

@@ -0,0 +1,47 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.fir.symbols
+
+import org.jetbrains.kotlin.descriptors.*
+import org.jetbrains.kotlin.ir.declarations.*
+import org.jetbrains.kotlin.ir.symbols.*
+
+class Fir2IrClassSymbol :
+    Fir2IrBindableSymbol<ClassDescriptor, IrClass>(),
+    IrClassSymbol
+
+class Fir2IrEnumEntrySymbol :
+    Fir2IrBindableSymbol<ClassDescriptor, IrEnumEntry>(),
+    IrEnumEntrySymbol
+
+class Fir2IrFieldSymbol :
+    Fir2IrBindableSymbol<PropertyDescriptor, IrField>(),
+    IrFieldSymbol
+
+class Fir2IrTypeParameterSymbol :
+    Fir2IrBindableSymbol<TypeParameterDescriptor, IrTypeParameter>(),
+    IrTypeParameterSymbol
+
+class Fir2IrValueParameterSymbol :
+    Fir2IrBindableSymbol<ParameterDescriptor, IrValueParameter>(),
+    IrValueParameterSymbol
+
+class Fir2IrVariableSymbol :
+    Fir2IrBindableSymbol<VariableDescriptor, IrVariable>(),
+    IrVariableSymbol
+
+class Fir2IrSimpleFunctionSymbol :
+    Fir2IrBindableSymbol<FunctionDescriptor, IrSimpleFunction>(),
+    IrSimpleFunctionSymbol
+
+class Fir2IrConstructorSymbol :
+    Fir2IrBindableSymbol<ClassConstructorDescriptor, IrConstructor>(),
+    IrConstructorSymbol
+
+class Fir2IrPropertySymbol :
+    Fir2IrBindableSymbol<PropertyDescriptor, IrProperty>(),
+    IrPropertySymbol
+