[libcxx] Enable noexcept for GCC 4.6 and greater
[libcxx] Enable noexcept for GCC 4.6 and greater

Summary:
This patch allows GCC 4.6 and above to use `noexcept` as opposed to `throw()`. 

Is it an ABI safe change to suddenly switch on `noexcept`? I imagine it must be because it's disabled in w/ clang in C++03 but not C++11.


Reviewers: danalbert, jroelofs, mclow.lists

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D15516

git-svn-id: 756ef344af921d95d562d9e9f9389127a89a6314@255683 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx