`M5-0-20`: Exclude pointer assign operators

[lcartey]

Affected rules

• M5-0-20
• M5-0-21
• RULE-10-1

Description

In the database we (slightly surprisingly) consider pointer assignment to be a bitwise expression:
https://github.com/github/codeql/blob/f7ca8e5b396ce5fb8bcc52c003905529766ec6d2/cpp/ql/lib/semmlecode.cpp.dbscheme#L1319-L1325

Example

void test_add(char *val) {
  int add = 2;
  val += add; // COMPLIANT[FALSE_POSITIVE]
}