R600/SI: Only form min/max with 1 use.

If the condition is used for something else, this increases
the number of instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224646 91177308-0d34-0410-b5e6-96231b3b80d8
Masked load and store codegen - fixed 128-bit vectors
The codegen failed on 128-bit types on AVX2.
I added patterns and in td files and tests.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224647 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Remove outdated comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224648 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unused variable, initializer, and accessor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224650 91177308-0d34-0410-b5e6-96231b3b80d8