Update these declarations of operator delete (and delete[]) to have noexcept,
as required per core issue 1552 and warned about with
-Wimplicit-exception-spec-mismatch.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201014 91177308-0d34-0410-b5e6-96231b3b80d8