AMDGPU: Remove -mcpu=SI

Leftover from before amdgcn/r600 split.

llvm-svn: 310277
diff --git a/llvm/test/CodeGen/AMDGPU/large-constant-initializer.ll b/llvm/test/CodeGen/AMDGPU/large-constant-initializer.ll
index c46d68e..b762a91 100644
--- a/llvm/test/CodeGen/AMDGPU/large-constant-initializer.ll
+++ b/llvm/test/CodeGen/AMDGPU/large-constant-initializer.ll
@@ -1,4 +1,4 @@
-; RUN: llc -march=amdgcn -mcpu=SI < %s
+; RUN: llc -march=amdgcn -mcpu=tahiti < %s
 ; RUN: llc -march=amdgcn -mcpu=tonga < %s
 ; CHECK: s_endpgm