R600/SI: Use external symbols for scratch buffer

We were passing the scratch buffer address to the shaders via user sgprs,
but now we use external symbols and have the driver patch the shader
using reloc information.

llvm-svn: 226586
diff --git a/llvm/lib/Target/R600/SIDefines.h b/llvm/lib/Target/R600/SIDefines.h
index 73a9c73..1c74dda 100644
--- a/llvm/lib/Target/R600/SIDefines.h
+++ b/llvm/lib/Target/R600/SIDefines.h
@@ -163,4 +163,5 @@
 #define R_00B860_COMPUTE_TMPRING_SIZE                                   0x00B860
 #define   S_00B860_WAVESIZE(x)                                        (((x) & 0x1FFF) << 12)
 
+
 #endif