[JVM IR] Copy metadata in IrFieldBuilder.

This fixes an issue with lateinit properties where the metadata from
the original field was not copied to the nullable field in
LateinitLowering. Also consolidated related tests.

compiler/ir/backend.common/src/org/jetbrains/kotlin/ir/builders/declarations/declarationBuilders.kt

@@ -47,6 +47,7 @@ fun IrFieldBuilder.buildField(): IrField {
         name, type, visibility, isFinal, isExternal, isStatic,
         origin == IrDeclarationOrigin.FAKE_OVERRIDE
     ).also {
+        it.metadata = metadata
         wrappedDescriptor.bind(it)
     }
 }

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/descriptors/JvmDeclarationFactory.kt

@@ -181,7 +181,6 @@ class JvmDeclarationFactory(
                 initializer = oldField.initializer
                     ?.replaceThisByStaticReference(this@JvmDeclarationFactory, oldParent, oldParent.thisReceiver!!)
                     ?.patchDeclarationParents(this) as IrExpressionBody?
-                (this as IrFieldImpl).metadata = oldField.metadata
             }
         }
     }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/builders/declarations/IrFieldBuilder.kt

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.ir.builders.declarations
 
 import org.jetbrains.kotlin.ir.declarations.IrField
+import org.jetbrains.kotlin.ir.declarations.MetadataSource
 import org.jetbrains.kotlin.ir.types.IrType
 
 class IrFieldBuilder : IrDeclarationBuilder() {
@@ -15,6 +16,7 @@ class IrFieldBuilder : IrDeclarationBuilder() {
     var isFinal: Boolean = false
     var isExternal: Boolean = false
     var isStatic: Boolean = false
+    var metadata: MetadataSource.Property? = null
 
     fun updateFrom(from: IrField) {
         super.updateFrom(from)
@@ -23,5 +25,6 @@ class IrFieldBuilder : IrDeclarationBuilder() {
         isFinal = from.isFinal
         isExternal = from.isExternal
         isStatic = from.isStatic
+        metadata = from.metadata
     }
 }