[clang] [clang][Interp] Implement IntegralAP::{div, rem} (PR #72614)

[Aaron Ballman via cfe-commits]

================
@@ -44,6 +44,24 @@ static_assert(MulA * MulB == 50, ""); // ref-error {{not an integral constant ex
 static_assert(MulA * 5 == 25, "");
 static_assert(-1 * MulB == -7, "");
 
+
+constexpr _BitInt(4) DivA = 2;
+constexpr _BitInt(2) DivB = 1;
+static_assert(DivA / DivB == 2, "");
+
+constexpr _BitInt(4) DivC = DivA / 0; // ref-error {{must be initialized by a constant expression}} \
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AaronBallman wrote:

I'd appreciate another test along the lines of:
```
constexpr int bottom = -1;
constexpr int top = INT_MIN;
constexpr int nope = top / bottom;
constexpr int noooo = top % bottom;
```

https://github.com/llvm/llvm-project/pull/72614