Fix for KT-12891: Allow to omit type in local delegated property declaration

#KT-12891 Fixed

compiler/testData/codegen/box/delegatedProperty/local/kt12891.kt

@@ -0,0 +1,5 @@
+//WITH_RUNTIME
+fun box(): String {
+    val x by lazy { "OK" }
+    return x
+}

compiler/testData/codegen/box/delegatedProperty/local/localValNoExplicitType.kt

@@ -0,0 +1,12 @@
+package foo
+
+import kotlin.reflect.KProperty
+
+class Delegate {
+    operator fun getValue(t: Any?, p: KProperty<*>): Int = 1
+}
+
+fun box(): String {
+    val prop by Delegate()
+    return if (prop == 1) "OK" else "fail"
+}

compiler/testData/codegen/box/delegatedProperty/local/localVarNoExplicitType.kt

@@ -0,0 +1,19 @@
+package foo
+
+import kotlin.reflect.KProperty
+
+class Delegate {
+    var inner = 1
+    operator fun getValue(t: Any?, p: KProperty<*>): Int = inner
+    operator fun setValue(t: Any?, p: KProperty<*>, i: Int) {
+        inner = i
+    }
+}
+
+fun box(): String {
+    var prop by Delegate()
+    if (prop != 1) return "fail get"
+    prop = 2
+    if (prop != 2) return "fail set"
+    return "OK"
+}

compiler/testData/codegen/script/localDelegatedPropertyNoExplicitType.kts

@@ -0,0 +1,14 @@
+import kotlin.reflect.KProperty
+
+class Delegate {
+    operator fun getValue(t: Any?, p: KProperty<*>): Int = 3
+}
+
+fun foo(): Int {
+    val prop by Delegate()
+    return prop
+}
+
+val x = foo()
+
+// expected: x: 3