Enable checks for pointer arithmetic

Quite a few places we've disobeyed this rule, so simply ignore them for
now to avoid new issues popping up.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I3e518a8e8742279afb3ad1a9dad54006ed109fb1
diff --git a/.clang-tidy b/.clang-tidy
index 61f2c68..eae3c72 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -202,6 +202,7 @@
 clang-analyzer-webkit.NoUncountedMemberChecker,
 clang-analyzer-webkit.RefCntblBaseVirtualDtor,
 cppcoreguidelines-init-variables,
+cppcoreguidelines-pro-bounds-pointer-arithmetic,
 cppcoreguidelines-pro-type-reinterpret-cast,
 cppcoreguidelines-special-member-functions,
 misc-misplaced-const,