IntegerAttr::get(Type, APInt) did not validate that the APInt's bit
width matched the expected bit width for the given type. For integer
types, the APInt width must equal the integer type's width. For index
types, the APInt width must equal IndexType::kInternalStorageBitWidth
(64 bits).
Passing an APInt with the wrong bit width could cause a
non-deterministic crash in StorageUniquer when comparing two IntegerAttr
instances for the same type but with different APInt widths.
This commit adds assertions in the get(Type, APInt) builder to catch
such misuse early in debug builds, providing a clear error message at
the call site rather than a cryptic crash in the storage uniquer.
Fixes#56401
Assisted-by: Claude Code
b1f8c28559