[FIR] Implement IR body generators for all FIR declarations generators in plugin prototype

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

@@ -187,6 +187,8 @@ class NaiveSourceBasedFileEntryImpl(
     override val name: String,
     private val lineStartOffsets: IntArray = intArrayOf()
 ) : IrFileEntry {
+    val lineStartOffsetsAreEmpty: Boolean
+        get() = lineStartOffsets.isEmpty()
 
     private val MAX_SAVED_LINE_NUMBERS = 50
 
@@ -254,4 +256,4 @@ inline fun MemberScope.findFirstFunction(name: String, predicate: (CallableMembe
 
 fun filterOutAnnotations(fqName: FqName, annotations: List<IrConstructorCall>): List<IrConstructorCall> {
     return annotations.filterNot { it.annotationClass.hasEqualFqName(fqName) }
-}
+}

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

@@ -42,6 +42,11 @@ fun IrFile.dumpTreesFromLineNumber(lineNumber: Int, normalizeNames: Boolean = fa
     return sb.toString()
 }
 
+fun IrFile.shouldSkipDump(): Boolean {
+    val entry = fileEntry as? NaiveSourceBasedFileEntryImpl ?: return false
+    return entry.lineStartOffsetsAreEmpty
+}
+
 class DumpIrTreeVisitor(
     out: Appendable,
     normalizeNames: Boolean = false,