Revert "Eliminate recursive calls between String.getChars and AbstractStringBuilder.append"

This reverts commit a318a7b86421714e64560c97e9f1279f2abfce7e.

Reason for revert: The information removed from the AIOOBE
message may be useful for developers, so let's have it back.
There is no reason to try and avoid recursive calls that
should be essentially impossible based on a non-reproducible
crash on an old Android version. And the mitigation was also
incomplete anyway as other similar unreachable recursive
paths were missed.

Bug: 201621581
Change-Id: I99ff5a3c6d11c93a0aee9093b038e3daa01adb5b
1 file changed