R600/SI: Add intrinsics for texture sampling with user derivatives

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186008 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Initial support for LDS/GDS instructions

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186009 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Add intrinsic for retrieving the current thread ID

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186010 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Add pattern for the AMDGPU.barrier.local intrinsic

lit test coverage to follow in the next commit.

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186011 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Initial local memory support

Enough for the radeonsi driver to use it for calculating derivatives.

Reviewed-by: Tom Stellard <thomas.stellard@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186012 91177308-0d34-0410-b5e6-96231b3b80d8
Simplify code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186013 91177308-0d34-0410-b5e6-96231b3b80d8
Safeguard DBG_VALUE handling. Unbreaks the ASAN buildbot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186014 91177308-0d34-0410-b5e6-96231b3b80d8
Use the appropriate unsigned int type for the offset.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186015 91177308-0d34-0410-b5e6-96231b3b80d8