perf fix contains path

check both

Author: Jeremy Dorne

src/compiler/moduleSpecifiers.ts

@@ -234,10 +234,11 @@ namespace ts.moduleSpecifiers {
             : discoverProbableSymlinks(host.getSourceFiles(), getCanonicalFileName, cwd);
 
         const useCaseSensitiveFileNames = !host.useCaseSensitiveFileNames || host.useCaseSensitiveFileNames();
+        const compareStrings = useCaseSensitiveFileNames ? compareStringsCaseSensitive : compareStringsCaseInsensitive;
         const realPathToSymlinks = links.getRealPathToSymlinks();
         const result = realPathToSymlinks && forEachEntry(realPathToSymlinks, (paths, resolved) => {
             return forEach(targets, target => {
-                if (!containsPath(resolved, target, !useCaseSensitiveFileNames)) {
+                if (compareStrings(target.slice(0, resolved.length), resolved) !== Comparison.EqualTo || !containsPath(resolved, target, !useCaseSensitiveFileNames)) {
                     return;
                 }