[SYCL] Attempt to exclude sporadic output issues in CI for printf (#736)

Use `std::endl` after `cout` in FP-typed tests for printf to
guarantee that the buffer gets flushed during LIT execution.

Signed-off-by: Artem Gindinson <artem.gindinson@intel.com>

Author: Artem Gindinson

SYCL/Printf/double.cpp

@@ -80,6 +80,7 @@ int main() {
                  "double -0x1.b4154d8cccccdp+2, -0X1.B4154D8CCCCCDP+2\n"
                  "mixed 0x1.91eb86p+1, -0X1.B4154D8CCCCCDP+2\n"
                  "double -6.8138, -6.8138\n"
-                 "mixed 3.14, -6.8138\n";
+                 "mixed 3.14, -6.8138"
+              << std::endl;
   return 0;
 }

SYCL/Printf/float.cpp

@@ -61,7 +61,8 @@ int main() {
                  "Printing hard-coded output from the host side:\n"
               << "3.140000e+00, 3.140000E+00\n"
                  "0x1.91eb86p+1, 0X1.91EB86P+1\n"
-                 "3.14, 3.14\n";
+                 "3.14, 3.14"
+              << std::endl;
     return 0;
   }
 #endif // !__SYCL_USE_NON_VARIADIC_SPIRV_OCL_PRINTF__