remove using namespace std and use std namespace explicitly (#2125)

Removes `using namespace std` and adds `std::` explicitly instead, which
is usually on calls to `min`.

This is generally best practice, and it also might be helpful when there
are the same function names in the std namespace and in the global
namespace (e.g. #1833).

test_common/harness/parseParameters.cpp

@@ -25,8 +25,6 @@
 #include <sys/stat.h>
 #include <string.h>
 
-using namespace std;
-
 #define DEFAULT_COMPILATION_PROGRAM "cl_offline_compiler"
 #define DEFAULT_SPIRV_VALIDATOR "spirv-val"