[cfe-commits] Remove redundant c_str() calls in the clang code base

[Manuel Klimek]

The attached patch was automatically generated by the example tool for
review in: http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20110523/042163.html
(contributed by Marcin, cc'ed).

This brought up a use of ConstantArray::get that was based on an older
implementation of the interface, but fixed by calling .c_str() after
appending a null-byte to a string and handing it to a StringRef. I
deleted the outdated comment on the implementation of get(), as the
comment in the header nicely explains the correct (and up-to-date)
behavior.

Cheers,
/Manuel
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