[CIR][ABI] Add _BitInt flag to IntType (#188113) Add an optional `bitint` parameter to `cir::IntType` so CIR can distinguish `_BitInt(N)` from builtin integer types like `__int128`. Both lower to the same LLVM integer type, but they have different ABI rules (alignment, passing convention) on x86_64. The flag is set during CIRGen for `Type::BitInt`, printed/parsed as `!cir.int<s, 128, bitint>`, and excluded from `isFundamental()`. Existing 2-arg `IntType::get()` calls continue to work via a default parameter.
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