Generate backing fields and initializers for external constants

compiler/frontend/src/org/jetbrains/kotlin/resolve/resolveUtil.kt

@@ -12,6 +12,7 @@ import org.jetbrains.kotlin.resolve.source.KotlinSourceElement
 fun PropertyDescriptor.hasBackingField(bindingContext: BindingContext?): Boolean = when {
     kind == CallableMemberDescriptor.Kind.FAKE_OVERRIDE -> overriddenDescriptors.any { it.hasBackingField(bindingContext) }
     source is KotlinSourceElement && bindingContext != null -> bindingContext.get(BindingContext.BACKING_FIELD_REQUIRED, this) ?: false
+    compileTimeInitializer != null -> true
     getter != null -> false
     else -> true
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeclarationStubGenerator.kt

@@ -81,14 +81,11 @@ class DeclarationStubGenerator(
 
     internal fun generatePropertyStub(descriptor: PropertyDescriptor, bindingContext: BindingContext? = null): IrProperty =
         IrPropertyImpl(UNDEFINED_OFFSET, UNDEFINED_OFFSET, origin, descriptor).also { irProperty ->
-            val getterDescriptor = descriptor.getter
             if (descriptor.hasBackingField(bindingContext)) {
                 irProperty.backingField = generateFieldStub(descriptor)
             }
-            if (getterDescriptor != null) {
-                irProperty.getter = generateFunctionStub(getterDescriptor)
-            }
 
+            irProperty.getter = descriptor.getter?.let { generateFunctionStub(it) }
             irProperty.setter = descriptor.setter?.let { generateFunctionStub(it) }
         }
 
@@ -109,7 +106,15 @@ class DeclarationStubGenerator(
             origin,
             descriptor.original,
             descriptor.type.toIrType()
-        )
+        ).apply {
+            initializer = descriptor.compileTimeInitializer?.let {
+                IrExpressionBodyImpl(
+                    constantValueGenerator.generateConstantValueAsExpression(
+                        UNDEFINED_OFFSET, UNDEFINED_OFFSET, it
+                    )
+                )
+            }
+        }
     }
 
     fun generateFunctionStub(descriptor: FunctionDescriptor): IrSimpleFunction {

compiler/testData/ir/irText/stubs/constFromBuiltins__kotlin.Int.txt

@@ -217,15 +217,27 @@ CLASS IR_EXTERNAL_DECLARATION_STUB CLASS name:Int modality:FINAL visibility:publ
     $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int.Companion flags:
     CONSTRUCTOR IR_EXTERNAL_DECLARATION_STUB visibility:private <> () returnType:kotlin.Int.Companion flags:primary
     PROPERTY IR_EXTERNAL_DECLARATION_STUB name:MAX_VALUE visibility:public modality:FINAL flags:const,val
+      FIELD IR_EXTERNAL_DECLARATION_STUB name:MAX_VALUE type:kotlin.Int visibility:public flags:final
+        EXPRESSION_BODY
+          CONST Int type=kotlin.Int value=2147483647
       FUN IR_EXTERNAL_DECLARATION_STUB name:<get-MAX_VALUE> visibility:public modality:FINAL <> ($this:kotlin.Int.Companion) returnType:kotlin.Int flags:
         $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int.Companion flags:
     PROPERTY IR_EXTERNAL_DECLARATION_STUB name:MIN_VALUE visibility:public modality:FINAL flags:const,val
+      FIELD IR_EXTERNAL_DECLARATION_STUB name:MIN_VALUE type:kotlin.Int visibility:public flags:final
+        EXPRESSION_BODY
+          CONST Int type=kotlin.Int value=-2147483648
       FUN IR_EXTERNAL_DECLARATION_STUB name:<get-MIN_VALUE> visibility:public modality:FINAL <> ($this:kotlin.Int.Companion) returnType:kotlin.Int flags:
         $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int.Companion flags:
     PROPERTY IR_EXTERNAL_DECLARATION_STUB name:SIZE_BITS visibility:public modality:FINAL flags:const,val
+      FIELD IR_EXTERNAL_DECLARATION_STUB name:SIZE_BITS type:kotlin.Int visibility:public flags:final
+        EXPRESSION_BODY
+          CONST Int type=kotlin.Int value=32
       FUN IR_EXTERNAL_DECLARATION_STUB name:<get-SIZE_BITS> visibility:public modality:FINAL <> ($this:kotlin.Int.Companion) returnType:kotlin.Int flags:
         $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int.Companion flags:
     PROPERTY IR_EXTERNAL_DECLARATION_STUB name:SIZE_BYTES visibility:public modality:FINAL flags:const,val
+      FIELD IR_EXTERNAL_DECLARATION_STUB name:SIZE_BYTES type:kotlin.Int visibility:public flags:final
+        EXPRESSION_BODY
+          CONST Int type=kotlin.Int value=4
       FUN IR_EXTERNAL_DECLARATION_STUB name:<get-SIZE_BYTES> visibility:public modality:FINAL <> ($this:kotlin.Int.Companion) returnType:kotlin.Int flags:
         $this: VALUE_PARAMETER IR_EXTERNAL_DECLARATION_STUB name:<this> type:kotlin.Int.Companion flags:
     FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean flags: