[JS IR BE] Add intrinsic for hashCode on String

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsIntrinsics.kt

@@ -145,6 +145,7 @@ class JsIntrinsics(private val irBuiltIns: IrBuiltIns, val context: JsIrBackendC
     val jsHashCode = getInternalFunction("hashCode")
     val jsGetNumberHashCode = getInternalFunction("getNumberHashCode")
     val jsGetObjectHashCode = getInternalFunction("getObjectHashCode")
+    val jsGetStringHashCode = getInternalFunction("getStringHashCode")
     val jsToString = getInternalFunction("toString")
     val jsAnyToString = getInternalFunction("anyToString")
     val jsCompareTo = getInternalFunction("compareTo")

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/calls/PrimitiveContainerMemberCallTransformer.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.
  */
 
@@ -7,15 +7,12 @@ package org.jetbrains.kotlin.ir.backend.js.lower.calls
 
 import org.jetbrains.kotlin.ir.backend.js.JsIrBackendContext
 import org.jetbrains.kotlin.ir.declarations.IrConstructor
-import org.jetbrains.kotlin.ir.expressions.IrCall
-import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
 import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.expressions.IrFunctionAccessExpression
 import org.jetbrains.kotlin.ir.expressions.impl.IrCallImpl
 import org.jetbrains.kotlin.ir.symbols.IrClassSymbol
-import org.jetbrains.kotlin.ir.symbols.IrFunctionSymbol
-import org.jetbrains.kotlin.ir.util.getSimpleFunction
 import org.jetbrains.kotlin.ir.util.getPropertyGetter
+import org.jetbrains.kotlin.ir.util.getSimpleFunction
 
 class PrimitiveContainerMemberCallTransformer(private val context: JsIrBackendContext) : CallsTransformer {
     private val intrinsics = context.intrinsics
@@ -48,6 +45,7 @@ class PrimitiveContainerMemberCallTransformer(private val context: JsIrBackendCo
                 }
             }
 
+            add(context.irBuiltIns.stringClass.hashCodeFunction, intrinsics.jsGetStringHashCode, true)
             add(context.irBuiltIns.stringClass.lengthProperty, context.intrinsics.jsArrayLength, true)
             add(context.irBuiltIns.stringClass.getFunction, intrinsics.jsCharSequenceGet, true)
             add(context.irBuiltIns.stringClass.subSequence, intrinsics.jsCharSequenceSubSequence, true)
@@ -89,3 +87,6 @@ private val IrClassSymbol.lengthProperty
 
 private val IrClassSymbol.subSequence
     get() = getSimpleFunction("subSequence")!!
+
+private val IrClassSymbol.hashCodeFunction
+    get() = getSimpleFunction("hashCode")!!