Add some tests which had heretofore evaded 'git add'.

llvm-svn: 157591

libclc/test/add_sat.cl

@@ -0,0 +1,3 @@
+__kernel void foo(__global char *a, __global char *b, __global char *c) {
+  *a = add_sat(*b, *c);
+}

libclc/test/as_type.cl

@@ -0,0 +1,3 @@
+__kernel void foo(int4 *x, float4 *y) {
+  *x = as_int4(*y);
+}