Add some new String methods in JDK 11 to built-ins mapping blacklist

These three methods are conflicting with existing extensions,
thus the behavior might be changed when switching to JDK 11

Probably, it's worth revisiting our strategy here,
e.g. by blacklisting all new methods in

 #KT-24974 Fixed

compiler/tests-java8/tests/org/jetbrains/kotlin/serialization/builtins/AdditionalBuiltInsMembersSignatureListsTest.kt

@@ -57,8 +57,13 @@ class AdditionalBuiltInsMembersSignatureListsTest : KotlinTestWithEnvironment()
 
             val scope = classDescriptor.unsubstitutedMemberScope
 
+            val lateJdkSignatures = LATE_JDK_SIGNATURES[internalName] ?: emptySet()
+
             jvmDescriptors.forEach {
                 jvmDescriptor ->
+
+                if (jvmDescriptor in lateJdkSignatures) return@forEach
+
                 val stringName = jvmDescriptor.split("(")[0]
                 val functions =
                         if (stringName == "<init>")
@@ -72,4 +77,8 @@ class AdditionalBuiltInsMembersSignatureListsTest : KotlinTestWithEnvironment()
             }
         }
     }
+
+    private val LATE_JDK_SIGNATURES = mapOf(
+        "java/lang/String" to setOf("isBlank()Z", "lines()Ljava/util/stream/Stream;", "repeat(I)Ljava/lang/String;")
+    )
 }