[patch][pr23266] Fix some raw_svector_ostream::pwrite problems

[Rafael Espíndola]

The fix-buffer patch is a simple bug fix for when pwrite changes the
size of the underlying stream.

The issue that remains is that pwrite changing the current position is
somewhat surprising.

That also happens on OS X when using O_APPEND. The attached test
creates a file with "defghi\n" in it, so there is some precedent. (on
linux one gets "abcdefghi").

In any case, if that is too confusing, we can also just disallow it,
which is what the other patch does. If disallowing it, should we
rename it?

Cheers,
Rafael
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