Add builtIns property to TargetPlatform

Add utility to get TargetPlatform by JetElement

compiler/frontend/src/org/jetbrains/kotlin/resolve/TargetPlatform.kt

@@ -16,6 +16,7 @@
 
 package org.jetbrains.kotlin.resolve
 
+import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.container.StorageComponentContainer
 import org.jetbrains.kotlin.container.useInstance
 import org.jetbrains.kotlin.resolve.calls.checkers.*
@@ -32,6 +33,7 @@ public abstract class TargetPlatform(
     }
 
     public abstract val platformConfigurator: PlatformConfigurator
+    public val builtIns: KotlinBuiltIns = KotlinBuiltIns.getInstance()
 
     public object Default : TargetPlatform("Default") {
         override val platformConfigurator = PlatformConfigurator(DynamicTypesSettings(), listOf(), listOf(), listOf(), listOf(), listOf())

idea/idea-analysis/src/org/jetbrains/kotlin/idea/project/Platform.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.idea.project
+
+import org.jetbrains.kotlin.psi.JetElement
+import org.jetbrains.kotlin.resolve.TargetPlatform
+
+val JetElement.platform: TargetPlatform
+    get() = TargetPlatformDetector.getPlatform(getContainingJetFile())