[ShrinkWrap] Consider constant pool access as non-stack access (#164393) As far as I understand, constant pool access does not access stack and accesses read-only memory. This patch considers constant pool access as non-stack access allowing shrink wrapping to happen in the concerned test. We should be seeing perf improvement with povray benchmark from SPEC17(around 12% with -flto -Ofast) after this patch. An NFC PR #162476 already exists to upload the test before the patch but approval has got delayed. So, as @davemgreen suggested in that PR, I have uploaded the test and patch in this single PR to show how test looks like.
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