Silence static analyzer warnings about memory leaks

The static analyzer complains that this memory is leaked regardless of
how I try to work around it (unless we escape the memory by using a
global or something, but...). Basically, as long as there's some sort
of operation on the reinterpret_cast'ed pointer, it complains. If we
remove the bitwise negations, it doesn't. Doing so would presumably
defeat the purpose of this test, though, so add a NOLINT.

Bug: 27101951
Test: mma. No more static analyzer warning for this file.
Change-Id: If9008946a2145d17b8651535141bfd7ec9224739

libmemunreachable/tests/MemUnreachable_test.cpp

@@ -27,6 +27,9 @@ namespace android {
 
 class HiddenPointer {
  public:
+  // Since we're doing such a good job of hiding it, the static analyzer
+  // thinks that we're leaking this `malloc`. This is probably related to
+  // https://bugs.llvm.org/show_bug.cgi?id=34198. NOLINTNEXTLINE
   explicit HiddenPointer(size_t size = 256) { Set(malloc(size)); }
   ~HiddenPointer() { Free(); }
   void* Get() { return reinterpret_cast<void*>(~ptr_); }