Split library loading test into three for different backends

Author: aobolensk

sycl/test/basic_tests/library_loading.cpp

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+// REQUIRES: linux
+// UNSUPPORTED: cuda
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
+// RUN: env SYCL_PI_TRACE=-1 %t.out 2>&1 | FileCheck %s
+
+// Checks pi traces when libpi_cuda is not present
+#include "library_loading_impl.h"
+// CHECK: SYCL_PI_TRACE[-1]: dlopen(libpi_cuda.so) failed with <libpi_cuda.so: cannot open shared object file: No such file or directory>

sycl/test/basic_tests/library_loading/library_loading_cuda.cpp

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+// REQUIRES: linux
+// UNSUPPORTED: esimd_emulator_be
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
+// RUN: env SYCL_PI_TRACE=-1 %t.out 2>&1 | FileCheck %s
+
+// Checks pi traces when libpi_esimd_emulator is not present
+#include "library_loading_impl.h"
+// CHECK: SYCL_PI_TRACE[-1]: dlopen(libpi_esimd_emulator.so) failed with <libpi_esimd_emulator.so: cannot open shared object file: No such file or directory>

sycl/test/basic_tests/library_loading/library_loading_esimd.cpp

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+// REQUIRES: linux
+// UNSUPPORTED: hip_be
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
+// RUN: env SYCL_PI_TRACE=-1 %t.out 2>&1 | FileCheck %s
+
+// Checks pi traces when libpi_hip is not present
+#include "library_loading_impl.h"
+// CHECK: SYCL_PI_TRACE[-1]: dlopen(libpi_hip.so) failed with <libpi_hip.so: cannot open shared object file: No such file or directory>

sycl/test/basic_tests/library_loading/library_loading_hip.cpp

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+#include <CL/sycl.hpp>
+
+using namespace cl::sycl;
+
+int main() {
+  queue q;
+  q.submit([&](handler &cgh) {});
+}