We have located a bug in AssemblyWriter::printModuleSummaryIndex(). This
function outputs path strings incorrectly. Backslashes in the string are not
correctly escaped. Hence, only windows environments are affected.
Consequently, if a path name contains a backslash followed by two hexadecimal
characters, the sequence is incorrectly interpreted when the output is read by
another component. This mangles the path and results in error.
This patch fixes this issue by calling printEscapedString() to output the paths.