[Sourcemap] Extract addLink from SourceMap3Builder as a addSourceMappingURL

The general goal is remove dependency on TextOutput and
make it simpler to use for wasm backend.

js/js.translator/src/org/jetbrains/kotlin/js/facade/TranslationResult.kt

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.js.config.SourceMapSourceEmbedding
 import org.jetbrains.kotlin.js.sourceMap.SourceFilePathResolver
 import org.jetbrains.kotlin.js.sourceMap.SourceMap3Builder
 import org.jetbrains.kotlin.js.sourceMap.SourceMapBuilderConsumer
+import org.jetbrains.kotlin.js.sourceMap.addSourceMappingURL
 import org.jetbrains.kotlin.js.util.TextOutput
 import org.jetbrains.kotlin.js.util.TextOutputImpl
 import org.jetbrains.kotlin.name.FqName
@@ -134,7 +135,7 @@ abstract class TranslationResult protected constructor(val diagnostics: Diagnost
 
             getCode(output, sourceMapBuilderConsumer)
             if (sourceMapBuilderConsumer != null) {
-                sourceMapBuilder.addLink()
+                output.addSourceMappingURL(outputFile)
             }
             val code = output.toString()
 
@@ -150,7 +151,7 @@ abstract class TranslationResult protected constructor(val diagnostics: Diagnost
                 sourceMapBuilder.skipLinesAtBeginning(StringUtil.getLineBreakCount(prefix))
                 val sourceMapFile = SimpleOutputFile(sourceFiles, sourceMapBuilder.outFile.name, sourceMapBuilder.build())
                 outputFiles.add(sourceMapFile)
-                sourceMapBuilder.addLink()
+                output.addSourceMappingURL(outputFile)
             }
 
             return SimpleOutputFileCollection(outputFiles)