Alan Zhao 00264eac4d Revert "InstSimplify: Require instruction be parented"
This reverts commit 1536e299e63d7788f38117b0212ca50eb76d7a3b.

Reason: causes a regression in the inliner (see https://crbug.com/1454531 and https://reviews.llvm.org/rG1536e299e63d7788f38117b0212ca50eb76d7a3b#1217141)
2023-06-16 10:36:49 -07:00
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