[UNDERTOW-2743] Speedup by removing non pattern replaceAll with constant arg

replaceAll("ABC", "") is non Pattern method and therefore must be replaced to simple fast replace()
A proofs of changes: https://gist.github.com/tbw777/8a6ef60af21487c5faec67037099fd0b

Commit: apache/tomcat@399ea1b

Signed-off-by: Flavia Rainone <frainone@redhat.com>

Author: fl4via

src/main/java/org/apache/jasper/compiler/SmapUtil.java

@@ -758,12 +758,12 @@ private static String getSmap(String className, ClassLoader cl) {
 
         InputStream is = null;
         try {
-            is = cl.getResourceAsStream(className.replaceAll("\\.","/") + ".smap");
+            is = cl.getResourceAsStream(className.replace(".","/") + ".smap");
             if (is != null) {
                 encoding = SMAP_ENCODING;
                 found = true;
             } else {
-                is = cl.getResourceAsStream(className.replaceAll("\\.","/") + ".class");
+                is = cl.getResourceAsStream(className.replace(".","/") + ".class");
                 // Alternative approach would be to read the class file as per the
                 // JLS. That would require duplicating a lot of BCEL functionality.
                 int b = is.read();