R600: Reorganize tablegen instruction definitions

Each GPU family now has its own file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204615 91177308-0d34-0410-b5e6-96231b3b80d8
SelectionDAG: Allow promotion of SELECT nodes from float to int types

And vice-versa, as long as the types are the same width.

There are a few R600 tests that will cover this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204616 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Promote fp64 SELECT to i64

This type promotion is replacing a Tablegen pattern and it is already
covered by existing tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204617 91177308-0d34-0410-b5e6-96231b3b80d8