drqs-68825085: FTOPEN: 'bdlb': Updated 'bslstl_string.cpp' for merge.
drqs-68825085: FTOPEN: 'bdlb': Updated 'bslstl_string.cpp' for merge.

bloomberg/bde,bloomberg/bde,bloomberg/bde,che2/bde,che2/bde,bloomberg/bde,che2/bde,che2/bde,bloomberg/bde