[ASan] Fix large allocator test case to cope with 64k pages

Summary: My PowerPC64 Linux box has 64k pages. The test assumes 4k pages. Fix it.

Reviewers: glider, eugenis, samsonov

Reviewed By: samsonov

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D6228

llvm-svn: 221875

compiler-rt/test/asan/TestCases/Posix/large_allocator_unpoisons_on_free.cc

@@ -8,6 +8,7 @@
 #include <string.h>
 #include <sys/mman.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #ifdef __ANDROID__
 #include <malloc.h>
@@ -23,7 +24,7 @@ void *my_memalign(size_t boundary, size_t size) {
 #endif
 
 int main() {
-  const int kPageSize = 4096;
+  const long kPageSize = sysconf(_SC_PAGESIZE);
   void *p = my_memalign(kPageSize, 1024 * 1024);
   free(p);