Remove Kani redundant checks

[celinval]

I tried this code:

// dup.rs
use std::hint::black_box;

#[kani::proof]
fn check_division() {
    black_box(kani::any::<u8>() / kani::any::<u8>());
}

using the following command line invocation:

kani dup.rs

with Kani version: #2551

I expected to see this happen: There should be one division by zero check and one overflow check, and both fail.

Instead, this happened: For the same division, Kani reports 3 different checks of division by zero and 2 overflow checks.

RESULTS:
Check 1: check_division.assertion.1
	 - Status: FAILURE
	 - Description: "attempt to divide by zero"
	 - Location: operations.rs:11:15 in function check_division

Check 2: check_division.assertion.2
	 - Status: FAILURE
	 - Description: "attempt to divide with overflow"
	 - Location: operations.rs:11:15 in function check_division

Check 3: check_division.arithmetic_overflow.1
	 - Status: SUCCESS
	 - Description: "attempt to divide with overflow"
	 - Location: operations.rs:11:15 in function check_division

Check 4: check_division.arithmetic_overflow.2
	 - Status: SUCCESS
	 - Description: "attempt to divide by zero"
	 - Location: operations.rs:11:15 in function check_division

Check 5: check_division.division-by-zero.1
	 - Status: SUCCESS
	 - Description: "division by zero"
	 - Location: operations.rs:11:15 in function check_division

Note: Before the upgrade (#2551), the test above would generate 3 checks. One for overflow and 2 for division by zero.