Implement script instance capturing in script lowering

for regular classes only. Reimplementing the main behavior of the
old BE and implementing few cases on top of it.
#KT-19423 fixed

compiler/testData/codegen/script/scriptInstanceCapturing/anonymousObjectCapturesProperty.kts

@@ -0,0 +1,17 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+
+// expected: rv: 42
+
+fun foo() = B.bar()
+
+val life = 42
+
+interface A {
+    fun bar(): Int
+}
+
+val B = object : A {
+    override fun bar() = life
+}
+
+val rv = foo()

compiler/testData/codegen/script/scriptInstanceCapturing/classCapturesExtensionIndirect.kts

@@ -0,0 +1,20 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM
+
+// expected: rv: kotlin.Unit
+
+fun foo() {
+    B()
+}
+val b = B()
+
+class A
+fun A.ext() = Unit
+
+class B {
+    fun bar() {
+        A().ext()
+    }
+}
+
+val rv = foo()

compiler/testData/codegen/script/scriptInstanceCapturing/classCapturesExtensionIndirect2x.kts

@@ -0,0 +1,21 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM
+
+// expected: rv: kotlin.Unit
+
+class C {
+    fun foo() {
+        B()
+    }
+}
+
+class A
+fun A.ext() = Unit
+
+class B {
+    fun bar() {
+        A().ext()
+    }
+}
+
+val rv = C().foo()

compiler/testData/codegen/script/scriptInstanceCapturing/classCapturesFunction.kts

@@ -0,0 +1,14 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+
+// expected: rv: 42
+
+val x = 6
+val y = 7
+
+fun foo() = x
+
+class A {
+    fun bar() = foo() * y
+}
+
+val rv = A().bar()

compiler/testData/codegen/script/scriptInstanceCapturing/classCapturesProperty.kts

@@ -0,0 +1,11 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+
+// expected: rv: abc
+
+// KT-19423
+val used = "abc"
+class User {
+    val property = used // error: Expression is inaccessible from a nested class
+}
+
+val rv = User().property

compiler/testData/codegen/script/scriptInstanceCapturing/classCapturesPropertyInStringTemplate.kts

@@ -0,0 +1,18 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM
+
+// expected: rv: 42
+
+fun foo() = B().bar()
+
+val life = 42
+
+class A {
+    val x = "$life"
+}
+
+class B {
+    fun bar() = A().x
+}
+
+val rv = foo()

compiler/testData/codegen/script/scriptInstanceCapturing/classCapturesPropertyIndirect.kts

@@ -0,0 +1,18 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM
+
+// expected: rv: 42
+
+fun foo() = B().bar()
+
+val life = 42
+
+class A {
+    val x = life
+}
+
+class B {
+    fun bar() = A().x
+}
+
+val rv = foo()

compiler/testData/codegen/script/scriptInstanceCapturing/classCapturesPropertyIndirect2x.kts

@@ -0,0 +1,20 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM
+
+// expected: rv: 42
+
+class C {
+    fun foo() = B().bar()
+}
+
+val life = 42
+
+class A {
+    val x = life
+}
+
+class B {
+    fun bar() = A().x
+}
+
+val rv = C().foo()

compiler/testData/codegen/script/scriptInstanceCapturing/companionCapturesProperty.kts

@@ -0,0 +1,15 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM, JVM_IR
+
+// expected: rv: <nofield>
+
+// KT-30616
+val foo = "hello"
+
+class Bar(val s: String) {
+    companion object {
+        fun t() {
+            Bar(foo)
+        }
+    }
+}

compiler/testData/codegen/script/scriptInstanceCapturing/enumCapturesProperty.kts

@@ -0,0 +1,12 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM, JVM_IR
+
+// expected: rv: <nofield>
+
+// KT-30616
+val foo = "hello"
+
+enum class Bar(val s: String = foo) {
+
+    Eleven("0")
+}

compiler/testData/codegen/script/scriptInstanceCapturing/enumEntryCapturesProperty.kts

@@ -0,0 +1,11 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM, JVM_IR
+
+// expected: rv: <nofield>
+
+// KT-30616
+val foo = "hello"
+
+enum class Bar(val s: String) {
+    Eleven(s = foo)
+}

compiler/testData/codegen/script/scriptInstanceCapturing/interfaceCapturesProperty.kts

@@ -0,0 +1,18 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM, JVM_IR
+
+// expected: rv: 42
+
+fun foo() = B().bar()
+
+val life = 42
+
+interface A {
+    val x get() = life
+}
+
+class B : A {
+    fun bar() = x
+}
+
+val rv = foo()

compiler/testData/codegen/script/scriptInstanceCapturing/objectCapturesProperty.kts

@@ -0,0 +1,14 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM, JVM_IR
+
+// expected: rv: 42
+
+fun foo() = B.bar()
+
+val life = 42
+
+object B {
+    fun bar() = life
+}
+
+val rv = foo()

compiler/testData/codegen/script/scriptInstanceCapturing/objectCapturesPropertyIndirect.kts

@@ -0,0 +1,18 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM, JVM_IR
+
+// expected: rv: 42
+
+fun foo() = B.bar()
+
+val life = 42
+
+class A {
+    val x = life
+}
+
+object B {
+    fun bar() = A().x
+}
+
+val rv = foo()

compiler/testData/codegen/script/scriptInstanceCapturing/objectCapturesPropertyViaExtension.kts

@@ -0,0 +1,34 @@
+// IGNORE_BACKEND: JS, JS_IR, JS_IR_ES6, NATIVE, WASM
+// IGNORE_BACKEND: JVM_IR
+
+// expected: rv: <nofield>
+
+// This example shows a bug in the old BE
+// original issue - KT-49443, this is the reduced example of it.
+// Here the old BE manages to compile the script, because it assumes incorrect constructor of the DefaultEachEntryConfiguration class
+// on generating code for buildZip.
+// The original example from the issue works supposedly because the constructor is not called on the runtime.
+// In this example, uncommenting call to buildZip leads to the runtime exception, while uncommenting the call to copy or
+// moving DefaultEachEntryConfiguration class definition before ZipHelper breaks codegeneration (somewhat expectedly).
+// The JVM IR BE now generates correct error about invalid script instance capturing.
+
+interface I {
+    fun rename()
+}
+
+object ZipHelper {
+    fun buildZip() {
+        DefaultEachEntryConfiguration(0).rename()
+        // 0.copy()
+    }
+}
+
+class DefaultEachEntryConfiguration(val entry: Int) : I {
+    override fun rename() {
+        entry.copy()
+    }
+}
+
+fun Int.copy() = Unit
+
+//ZipHelper.buildZip()