Use packager's source map to resolve function name and clean up dead code in SP

Reviewed By: bnham

Differential Revision: D3649501

fbshipit-source-id: 62e13633436c645d9b43eb75c39b4ddcf0458eb3

Author: lukaspiatkowski

local-cli/server/middleware/jscProfilerMiddleware.js

@@ -31,6 +31,7 @@ class TreeTransformator {
         line: tree.lineNumber,
         column: tree.columnNumber,
       });
+      tree.functionName = original.name;
       tree.scriptId = tree.id;
       tree.url = 'file://' + original.source;
       tree.lineNumber = original.line;