FIR: support lateinit properties

compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -395,6 +395,7 @@ class RawFirBuilder(val session: FirSession) {
                 property.platformStatus,
                 property.hasModifier(KtTokens.OVERRIDE_KEYWORD),
                 property.hasModifier(KtTokens.CONST_KEYWORD),
+                property.hasModifier(KtTokens.LATEINIT_KEYWORD),
                 property.receiverTypeReference.convertSafe(),
                 propertyType,
                 property.isVar,

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt

@@ -163,6 +163,9 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
             if (memberDeclaration.isConst) {
                 print("const ")
             }
+            if (memberDeclaration.isLateInit) {
+                print("lateinit ")
+            }
         }
 
         visitNamedDeclaration(memberDeclaration)

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirProperty.kt

@@ -16,6 +16,8 @@ import org.jetbrains.kotlin.fir.visitors.FirVisitor
 interface FirProperty : @VisitedSupertype FirDeclaration, FirCallableMember, FirVariable {
     val isConst: Boolean
 
+    val isLateInit: Boolean
+
     // Should it be nullable or have some default?
     val getter: FirPropertyAccessor
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberPropertyImpl.kt

@@ -28,6 +28,7 @@ class FirMemberPropertyImpl(
     platformStatus: FirMemberPlatformStatus,
     isOverride: Boolean,
     override val isConst: Boolean,
+    override val isLateInit: Boolean,
     receiverType: FirType?,
     returnType: FirType,
     override val isVar: Boolean,

compiler/testData/fir/rawBuilder/declarations/simpleClass.kt

@@ -15,5 +15,5 @@ class SomeClass : SomeInterface {
         get() = true
         set(value) {}
 
-    var fau: Double
+    lateinit var fau: Double
 }

compiler/testData/fir/rawBuilder/declarations/simpleClass.txt

@@ -20,7 +20,7 @@ FILE: simpleClass.kt
             public? set(value: Boolean): <implicit> {
             }
 
-        public? final? property fau(var): Double
+        public? final? lateinit property fau(var): Double
             public? get(): Double
             public? set(value: Double): R|kotlin/Unit|