Cleanup: apply "Convert lambda to reference"

j2k/src/org/jetbrains/kotlin/j2k/CodeBuilder.kt

@@ -102,7 +102,7 @@ class CodeBuilder(private val topElement: PsiElement?, private var docConverter:
         if (commentInfo.isComment) {
             // Original comment was first in line, but there's no line break before the current one
             if (!commentInfo.isPostInsert && commentInfo.isFirstNonWhitespaceElementInLine &&
-                !builder.takeLastWhile { it.isWhitespace() }.contains('\n')) {
+                !builder.takeLastWhile(Char::isWhitespace).contains('\n')) {
                 builder.append('\n')
             }
 

j2k/src/org/jetbrains/kotlin/j2k/importConversion.kt

@@ -49,7 +49,7 @@ fun Converter.convertImport(anImport: PsiImportStatementBase, dumpConversion: Bo
     }
     else {
         convertImport(fqName, reference, onDemand, anImport is PsiImportStaticStatement)
-                .map { Import(it) }
+                .map(::Import)
     }
     return convertedImports.map { it.assignPrototype(anImport) }
 }