R600/SI: Add compute support for CI v2

v2:
  - Fix LDS size calculation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
llvm-svn: 193621
diff --git a/llvm/lib/Target/R600/AMDGPU.td b/llvm/lib/Target/R600/AMDGPU.td
index a722f55..f63617f 100644
--- a/llvm/lib/Target/R600/AMDGPU.td
+++ b/llvm/lib/Target/R600/AMDGPU.td
@@ -87,6 +87,8 @@
 def FeatureSouthernIslands : SubtargetFeatureGeneration<"SOUTHERN_ISLANDS",
         [Feature64BitPtr, FeatureFP64]>;
 
+def FeatureSeaIslands : SubtargetFeatureGeneration<"SEA_ISLANDS",
+        [Feature64BitPtr, FeatureFP64]>;
 //===----------------------------------------------------------------------===//
 
 def AMDGPUInstrInfo : InstrInfo {