[PATCH] [libcxx] Optimize vectors uninitialized construction of trivial types from an iterator range.

[Marshall Clow]

LGTM.


================
Comment at: include/vector:1394
@@ +1393,3 @@
+    typename iterator_traits<_ForwardIterator>::difference_type __new_size_diff = _VSTD::distance(__first, __last);
+    size_type __new_size = static_cast<size_type>(__new_size_diff);
+    if (__new_size <= capacity())
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I would combine these two lines into one:
`size_type __new_size = static_cast<size_type>(_VSTD::distance(__first, __last));`

and not bother with `__new_size_diff`

http://reviews.llvm.org/D8109

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