AMDGPU: Rename _RTN atomic instructions

Move the _RTN to the end of the name. It reads
better if the other addressing mode components
line up with the non-RTN version. It is also
more convenient to define saddr variants of
FLAT atomics to have the RTN last, and it is
good to have a consistent naming scheme.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308674 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed