[pull] main from llvm:main #703
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The main improvement is to the mfma tests. There are some mild regressions scattered around, and a few major ones. The worst regressions are in some of the bitcast tests; these are cases where the SGPR argument list runs out and uses VGPRs, and the copies-from-VGPR are misidentified as divergent. Most of the shufflevector tests are also regressions. These end up with cleaner MIR, but then get poor regalloc decisions.
Implement support for the OffsetOfExpr
Upstream ExtVectorElementExpr with result Vector type
) Per [LWG554](https://cplusplus.github.io/LWG/issue554), the rationale is that even if `true / false` traps, the values causing trap are the converted `int` values produced by usual arithmetic conversion, but not the original `bool` values. This is also true for all other non-promoted integer types. As a result, `std::numeric_limits<I>` should be `false` if `I` is a non non-promoted integer type. Fixes #166053.
…#165779) (#168034) Refer to #158276 for previous hotfix. In Z3, boolean expressions are incompatible with bitvec operators. However, C expressions like `-(5 && a)` will generate such symbolic expressions, which will be further used as an integer. To be compatible with such usages, this fix converts such expressions to integer using the existing `fromCast`.
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