Merge java.lang.String* from jdk-11.0.13-ga into the aosp/master branch

List of files:
  ojluni/src/main/java/java/lang/AbstractStringBuilder.java
  ojluni/src/main/java/java/lang/CharSequence.java
  ojluni/src/main/java/java/lang/StringBuffer.java
  ojluni/src/main/java/java/lang/StringBuilder.java
  ojluni/src/main/java/java/lang/StringLatin1.java

Bug: 247773125
Test: N/A
Change-Id: I5d2a1ebb09394ab9c98398f3592e65667c37f369