[Wasm] Add Wasm platform and K1 FE infrastructure

wasm/wasm.config/build.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
+
+dependencies {
+    api(project(":compiler:config"))
+}
+
+sourceSets {
+    "main" { projectDefault() }
+}

wasm/wasm.config/src/org/jetbrains/kotlin/platform/wasm/WasmPlatform.kt

@@ -0,0 +1,13 @@
+/*
+ * Copyright 2010-2019 JetBrains s.r.o. 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.platform.wasm
+
+import org.jetbrains.kotlin.platform.TargetPlatform
+import org.jetbrains.kotlin.platform.WasmPlatform
+
+object WasmPlatforms {
+    object Default : TargetPlatform(setOf(WasmPlatform))
+}