sin: Use unary_decl instead of custom inc file

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-By: Aaron Watry <awatry@gmail.com>
llvm-svn: 317254
diff --git a/libclc/generic/include/clc/math/sin.h b/libclc/generic/include/clc/math/sin.h
index 6d4cf5a..e674bd5 100644
--- a/libclc/generic/include/clc/math/sin.h
+++ b/libclc/generic/include/clc/math/sin.h
@@ -1,3 +1,7 @@
-#define __CLC_BODY <clc/math/sin.inc>
+#define __CLC_BODY <clc/math/unary_decl.inc>
+#define __CLC_FUNCTION sin
+
 #include <clc/math/gentype.inc>
+
 #undef __CLC_BODY
+#undef __CLC_FUNCTION