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

[Marshall Clow]

================
Comment at: include/vector:1029
@@ -1034,1 +1028,3 @@
+    __alloc_traits::__construct_range_forward(__a, __first, __last, this->__end_);
+    __annotator.__done();
 }
----------------
This is not exception safe.
If one of the constructions throws, then the ASAN annotations will be wrong.

http://reviews.llvm.org/D8109

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