JIT: libraries PGO assert during Find Loops #69032
Description
Many libraries pgo tests now failing with
Assert failure(PID 5952 [0x00001740], Thread: 6833 [0x1ab1]): Assertion failed 'gtOper == GT_CNS_INT' in '<>c__DisplayClass35_0:<TestTryUpdate>b__1(System.Object):this' during 'Find loops' (IL size 171; hash 0x83ebfa29; Tier1-OSR)
File: /__w/1/s/src/coreclr/jit/gentree.h Line: 2123
Image: /datadisks/disk1/work/9E9D08F3/p/dotnet
across various options and architectures.
Spot checking all the failures seem to be in Tier1-OSR compiles, so likely this is from #68725.
Similar asserts in the jit-experimental tests: https://dev.azure.com/dnceng/public/_build/results?buildId=1758339&view=ms.vss-test-web.build-test-results-tab