JVM IR: remove dependency of 'backend.jvm' on 'psi2ir', 'ir.serialization.jvm'

Add a new module 'backend.jvm.entrypoint' which depends on psi2ir and
contains code that runs psi2ir + JVM IR backend with serialization
implementations.

Hopefully this will allow to compile these modules in parallel and
reduce the build time.

compiler/ir/backend.jvm/build.gradle.kts

@@ -7,9 +7,7 @@ dependencies {
     compile(project(":kotlin-annotations-jvm"))
     compile(project(":compiler:backend"))
     compile(project(":compiler:ir.tree"))
-    compile(project(":compiler:ir.psi2ir"))
     compile(project(":compiler:ir.backend.common"))
-    compile(project(":compiler:ir.serialization.jvm"))
     api(project(":compiler:backend.common.jvm"))
     compileOnly(project(":compiler:ir.tree.impl"))
     compileOnly(intellijCoreDep()) { includeJars("intellij-core", "asm-all", "guava", rootProject = rootProject) }

compiler/ir/backend.jvm/entrypoint/build.gradle.kts

@@ -0,0 +1,19 @@
+plugins {
+    kotlin("jvm")
+    id("jps-compatible")
+}
+
+dependencies {
+    api(project(":compiler:ir.psi2ir"))
+    api(project(":compiler:backend.jvm"))
+    api(project(":compiler:ir.tree.impl"))
+    api(project(":compiler:ir.serialization.jvm"))
+    compileOnly(intellijCoreDep()) { includeJars("intellij-core", rootProject = rootProject) }
+}
+
+sourceSets {
+    "main" {
+        projectDefault()
+    }
+    "test" {}
+}

compiler/ir/backend.jvm/entrypoint/src/org/jetbrains/kotlin/backend/jvm/JvmIrCodegenFactory.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 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.
  */
 
@@ -32,7 +32,6 @@ import org.jetbrains.kotlin.ir.declarations.impl.IrFactoryImpl
 import org.jetbrains.kotlin.ir.descriptors.IrBuiltIns
 import org.jetbrains.kotlin.ir.descriptors.IrFunctionFactory
 import org.jetbrains.kotlin.ir.linkage.IrProvider
-import org.jetbrains.kotlin.ir.types.defaultType
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi2ir.Psi2IrConfiguration
@@ -178,10 +177,6 @@ class JvmIrCodegenFactory(private val phaseConfig: PhaseConfig) : CodegenFactory
         /* JvmBackendContext creates new unbound symbols, have to resolve them. */
         ExternalDependenciesGenerator(symbolTable, irProviders).generateUnboundSymbolsAsDependencies()
 
-        state.mapInlineClass = { descriptor ->
-            context.typeMapper.mapType(context.referenceClass(descriptor).defaultType)
-        }
-
         context.state.factory.registerSourceFiles(irModuleFragment.files.map(IrFile::getKtFile))
 
         JvmLower(context).lower(irModuleFragment)

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/JvmBackendContext.kt

@@ -37,6 +37,7 @@ import org.jetbrains.kotlin.ir.expressions.IrExpression
 import org.jetbrains.kotlin.ir.expressions.IrFunctionReference
 import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.types.IrType
+import org.jetbrains.kotlin.ir.types.defaultType
 import org.jetbrains.kotlin.ir.util.SymbolTable
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.resolve.jvm.JvmClassName
@@ -130,6 +131,12 @@ class JvmBackendContext(
 
     internal val continuationClassesVarsCountByType: MutableMap<IrAttributeContainer, Map<Type, Int>> = hashMapOf()
 
+    init {
+        state.mapInlineClass = { descriptor ->
+            typeMapper.mapType(referenceClass(descriptor).defaultType)
+        }
+    }
+
     internal fun referenceClass(descriptor: ClassDescriptor): IrClassSymbol =
         symbolTable.lazyWrapper.referenceClass(descriptor)