Bugfix for Codegen of atomic load/store/other ops.
Currently clang fires assertions on x86-64 on any atomic operations for long double operands. Patch fixes codegen for such operations.
Differential Revision: http://reviews.llvm.org/D6499


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@224230 91177308-0d34-0410-b5e6-96231b3b80d8