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

[Timm Baeder via cfe-commits]

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@@ -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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tbaederr wrote:

Using `int` means it won't use `IntegralAP` at all though. I've added those tests with `_BitInt(32)`.

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