Overview

Upstream handling for the __builtin_add_overflow, __builtin_sub_overflow, and __builtin_mul_overflow functions, including implemetation and lowering of the cir.binop.overflow operation and the related variations of these builtins.

Suggested minimal test case

bool test_add_overflow_uint_uint_uint(unsigned x, unsigned y, unsigned *res) { return __builtin_add_overflow(x, y, res); } 

Existing incubator tests

clang/test/CIR/CodeGen/builtins-overflow.cpp