[esan|cfrag] Add test struct-simple.cpp

[zhaoqin]

Summary

Adds test struct-simple.cpp for testing the cache-fragmentation tool.

[bruening]

This is for proper staging of http://reviews.llvm.org/D20486 and http://reviews.llvm.org/D20488 without any test failures after either CL.

compiler-rt/trunk/test/esan/TestCases/struct-simple.cpp

+// RUN: %clang_esan_frag -O0 %s -DPART -c -o %t-part.o 2>&1
+// RUN: %clang_esan_frag -O0 %s -DMAIN -c -o %t-main.o 2>&1
+// RUN: %clang_esan_frag -O0 %t-part.o %t-main.o -o %t 2>&1
+// RUN: %env_esan_opts=verbosity=2 %run %t 2>&1 | FileCheck %s
+
+// We generate two different object files from this file with different
+// macros, and then link them together. We do this to test how we handle
+// separate compilation with multiple compilation units.
+
+#include <stdio.h>
+
+extern "C" {
+  void part();
+}
+
+//===-- compilation unit without main function ----------------------------===//
+
+#ifdef PART
+void part()
+{
+}
+#endif // PART
+
+//===-- compilation unit with main function -------------------------------===//
+
+#ifdef MAIN
+int main(int argc, char **argv) {
+  // CHECK:      in esan::initializeLibrary
+  // CHECK:      in esan::processCompilationUnitInit
+  // CHECK:      in esan::processCompilationUnitInit
+  part();
+  return 0;
+  // CHECK-NEXT: in esan::finalizeLibrary
+  // CHECK-NEXT: {{.*}}EfficiencySanitizer is not finished: nothing yet to report
+  // CHECK:      in esan::processCompilationUnitExit
+  // CHECK:      in esan::processCompilationUnitExit
+}
+#endif // MAIN