fix crash by OOM, when search opened in editor (fix microsoft#135950)…

… - additional memory optimization [220Mb -> 15Mb] [1.6sec -> 2.2sec]

Slightly slower due to gc calls

usecase from microsoft#133348 (comment)
file for search - `plugins.pkgd.min.js` from https://github.com/froala/wysiwyg-editor

src/vs/workbench/contrib/searchEditor/browser/searchEditorSerialization.ts

@@ -38,7 +38,8 @@ const matchToSearchResultFormat = (match: Match, longestLineNumber: number): { l
 			const prefix = `  ${paddingStr}${lineNumber}: `;
 			const prefixOffset = prefix.length;
 
-			const line = (prefix + sourceLine).replace(/\r?\n?$/, '');
+			// split instead of replace to avoid creating a new string object
+			const line = prefix + sourceLine.split(/\r?\n?$/, 1)[0];
 
 			const rangeOnThisLine = ({ start, end }: { start?: number; end?: number; }) => new Range(1, (start ?? 1) + prefixOffset, 1, (end ?? sourceLine.length + 1) + prefixOffset);