Move file utils

Fixing IC after moving it from Gradle to the compiler in commit f40a3ef

Author: AlexeyTsvetkov

build-common/src/org/jetbrains/kotlin/incremental/buildUtil.kt

@@ -255,8 +255,6 @@ fun <Target> mapClassesFqNamesToFiles(
     return dirtyFiles
 }
 
-private fun File.isJavaFile() = extension.equals(JavaFileType.INSTANCE.defaultExtension, ignoreCase = true)
-
 private fun findSrcDirRoot(file: File, roots: Iterable<File>): File? =
         roots.firstOrNull { FileUtil.isAncestor(it, file, false) }
 

compiler/incremental-compilation-impl/src/org/jetbrains/kotlin/incremental/fileUtils.kt renamed to build-common/src/org/jetbrains/kotlin/incremental/fileUtils.kt

@@ -18,23 +18,14 @@ package org.jetbrains.kotlin.incremental
 
 import java.io.File
 
-internal fun File.isJavaFile() =
+fun File.isJavaFile() =
         extension.equals("java", ignoreCase = true)
 
-internal fun File.isKotlinFile(): Boolean =
+fun File.isKotlinFile(): Boolean =
     extension.let {
         "kt".equals(it, ignoreCase = true) ||
         "kts".equals(it, ignoreCase = true)
     }
 
-internal fun File.isClassFile(): Boolean =
+fun File.isClassFile(): Boolean =
         extension.equals("class", ignoreCase = true)
-
-internal fun listClassFiles(path: String): Sequence<File> =
-        File(path).walk().filter { it.isFile && it.isClassFile() }
-
-internal fun File.relativeOrCanonical(base: File): String =
-        relativeToOrNull(base)?.path ?: canonicalPath
-
-internal fun Iterable<File>.pathsAsStringRelativeTo(base: File): String =
-        map { it.relativeOrCanonical(base) }.sorted().joinToString()