Merge pull request microsoft#29935 from RyanCavanaugh/md5_2_sha

Use sha256 to hash file contents

Author: RyanCavanaugh

src/compiler/sys.ts

@@ -632,7 +632,7 @@ namespace ts {
                 getModifiedTime,
                 setModifiedTime,
                 deleteFile,
-                createHash: _crypto ? createMD5HashUsingNativeCrypto : generateDjb2Hash,
+                createHash: _crypto ? createSHA256Hash : generateDjb2Hash,
                 createSHA256Hash: _crypto ? createSHA256Hash : undefined,
                 getMemoryUsage() {
                     if (global.gc) {
@@ -1125,12 +1125,6 @@ namespace ts {
                 }
             }
 
-            function createMD5HashUsingNativeCrypto(data: string): string {
-                const hash = _crypto!.createHash("md5");
-                hash.update(data);
-                return hash.digest("hex");
-            }
-
             function createSHA256Hash(data: string): string {
                 const hash = _crypto!.createHash("sha256");
                 hash.update(data);