Fix mismatched malloc/free delete/new.

Modify the monitor code to override the delete operator. The problem
is the new operator is overloaded to return a pointer returned by
posix_memalign, but then it's freed with a delete, not a free call.

Also, fix the debugger code to use the [] for a std::unique_ptr to
match how the value is actually allocated.

Both problems found by ASAN.

Bug: 18202869

Change-Id: I2f3a2c02a7f35399b7ba6717b08a035089fab00d
diff --git a/runtime/monitor.h b/runtime/monitor.h
index 95e4460..b7245c1 100644
--- a/runtime/monitor.h
+++ b/runtime/monitor.h
@@ -141,6 +141,10 @@
     CHECK_EQ(error, 0) << strerror(error);
     return result;
   }
+
+  void operator delete(void* ptr) {
+    free(ptr);
+  }
 #endif
 
  private: