[LoopDist] Consider reads and writes together for runtime checks (#145623) Emit safety guards for ptr accesses when cross partition loads exist which have a corresponding store to the same address in a different partition. This will emit the necessary ptr checks for these accesses. The test case was obtained from SuperTest, which SiFive runs regularly. We enabled LoopDistribution by default in our downstream compiler, this change was part of that enablement.
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