[SYCL] add extra tests (intel#37)

- add tests from intel/llvm;
- make SYCL/ESIMD/mandelbrot tests generate data files in build directory and remove data file from GIT;
- rename regression directory to match llvm-test-suite naming (Regression);
- fix clang-format issues.

SYCL/SeparateCompile/sycl-external.cpp

@@ -0,0 +1,69 @@
+// Test1 - check that kernel can call a SYCL_EXTERNAL function defined in a
+// different object file.
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple -DSOURCE1 -c %s -o %t1.o
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple -DSOURCE2 -c %s -o %t2.o
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %t1.o %t2.o -o %t.exe
+// RUN: %CPU_RUN_PLACEHOLDER %t.exe
+// RUN: %GPU_RUN_PLACEHOLDER %t.exe
+// RUN: %ACC_RUN_PLACEHOLDER %t.exe
+//
+// Test2 - check that kernel can call a SYCL_EXTERNAL function defined in a
+// static library.
+// RUN: rm -f %t.a
+// RUN: llvm-ar crv %t.a %t1.o
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %t2.o -foffload-static-lib=%t.a -o %t.exe
+// RUN: %CPU_RUN_PLACEHOLDER %t.exe
+// RUN: %GPU_RUN_PLACEHOLDER %t.exe
+// RUN: %ACC_RUN_PLACEHOLDER %t.exe
+
+#include <CL/sycl.hpp>
+#include <iostream>
+
+#ifdef SOURCE1
+int bar(int b);
+
+SYCL_EXTERNAL
+int foo(int a, int b) { return a + bar(b); }
+
+int bar(int b) { return b + 5; }
+#endif // SOURCE1
+
+#ifdef SOURCE2
+SYCL_EXTERNAL
+int foo(int A, int B);
+
+int main(void) {
+  constexpr unsigned Size = 4;
+  int A[Size] = {1, 2, 3, 4};
+  int B[Size] = {1, 2, 3, 4};
+  int C[Size];
+
+  {
+    cl::sycl::range<1> range{Size};
+    cl::sycl::buffer<int, 1> bufA(A, range);
+    cl::sycl::buffer<int, 1> bufB(B, range);
+    cl::sycl::buffer<int, 1> bufC(C, range);
+
+    cl::sycl::queue().submit([&](cl::sycl::handler &cgh) {
+      auto accA = bufA.get_access<cl::sycl::access::mode::read>(cgh);
+      auto accB = bufB.get_access<cl::sycl::access::mode::read>(cgh);
+      auto accC = bufC.get_access<cl::sycl::access::mode::write>(cgh);
+
+      cgh.parallel_for<class Test>(range, [=](cl::sycl::id<1> ID) {
+        accC[ID] = foo(accA[ID], accB[ID]);
+      });
+    });
+  }
+
+  for (unsigned I = 0; I < Size; ++I) {
+    int Ref = foo(A[I], B[I]);
+    if (C[I] != Ref) {
+      std::cout << "fail: [" << I << "] == " << C[I] << ", expected " << Ref
+                << "\n";
+      return 1;
+    }
+  }
+  std::cout << "pass\n";
+  return 0;
+}
+#endif // SOURCE2