Fixes source maps in web worker (microsoft#157704)

Author: hediet

src/vs/base/worker/workerMain.ts

@@ -17,7 +17,8 @@
 					// see https://github.com/w3c/webappsec-trusted-types/wiki/Trusted-Types-for-function-constructor
 					const fnArgs = args.slice(0, -1).join(',');
 					const fnBody = args.pop()!.toString();
-					const body = `(function anonymous(${fnArgs}) {\n${fnBody}\n})`;
+					// Do not add a new line to fnBody, as this will confuse source maps.
+					const body = `(function anonymous(${fnArgs}) { ${fnBody}\n})`;
 					return body;
 				}
 			})