Refine AntPathMatcher optimizations

Refine the optimizations made in 6f55ab69 in order to restore binary
compatibility and resolve a regression.

Tests of the form pathMatcher.match("/foo/bar/**", "/foo/bar") should
return true as this was the behavior in Spring 4.2.

Issue: SPR-13913

spring-core/src/test/java/org/springframework/util/AntPathMatcherTests.java

@@ -128,6 +128,8 @@ public class AntPathMatcherTests {
 
 		assertFalse(pathMatcher.match("/x/x/**/bla", "/x/x/x/"));
 
+		assertTrue(pathMatcher.match("/foo/bar/**", "/foo/bar")) ;
+
 		assertTrue(pathMatcher.match("", ""));
 
 		assertTrue(pathMatcher.match("/{bla}.*", "/testing.html"));