am e406b316: Bug 1844104: Fix buffer overwrite bugs in CharsetEncoderICU and CharsetDecoderICU.

Merge commit 'e406b316295f07d40679ce2372051c3b2bce5de4'

* commit 'e406b316295f07d40679ce2372051c3b2bce5de4':
  Bug 1844104: Fix buffer overwrite bugs in CharsetEncoderICU and CharsetDecoderICU.