Add a reproducer for internal issue llvm#48.

clang/tools/sotoc/test/target/multiple_regions2.c

@@ -0,0 +1,34 @@
+// RUN: %sotoc-transform-compile
+// RUN: %run-on-host | %filecheck %s
+
+#include <stdio.h>
+
+int main() {
+
+  int i = 0;
+  int j = 0;
+
+  #pragma omp target 
+  {
+
+    #pragma omp parallel for private(j)
+    for(i=0; i<42; i++)
+    {
+      for(i=0; i<42; i++){}    
+    }
+
+    #pragma omp parallel for
+    for(i=0; i<42; i++)
+    {
+      #pragma omp atomic
+      j++;
+    }
+
+  printf("%d\n", j);
+  fflush(0);
+  }
+
+  return 0;
+}
+
+// CHECK: 42