Assertion failed 'data->GetRegNum() != REG_ARG_0' #77141
Description
runtime-coreclr libraries-pgo
Libraries Test Run checked coreclr Linux arm Release
This is pretty consistently failing in System.Runtime.Serialization.Xml.ReflectionOnly.Tests (4 out of last 5, in the other run #75827 hit)
+ printenv
+ grep COMPlus
COMPlus_TC_QuickJitForLoops=1
COMPlus_TieredCompilation=1
COMPlus_DbgMiniDumpName=/home/helixbot/dotnetbuild/dumps/coredump.%d.dmp
COMPlus_TieredPGO=1
COMPlus_DbgEnableMiniDump=1
...
Starting: System.Runtime.Serialization.Xml.ReflectionOnly.Tests (parallel test collections = on, max threads = 4)
Assert failure(PID 62 [0x0000003e], Thread: 69 [0x0045]): Assertion failed 'data->GetRegNum() != REG_ARG_0' in 'System.Runtime.Serialization.ReflectionClassWriter:ReflectionWriteClass(System.Runtime.Serialization.XmlWriterDelegator,System.Object,System.Runtime.Serialization.XmlObjectSerializerWriteContext,System.Runtime.Serialization.DataContracts.ClassDataContract,System.Xml.XmlDictionaryString[]):this' during 'Generate code' (IL size 100; hash 0xce1c5028; Tier1)
File: /__w/1/s/src/coreclr/jit/codegenarm.cpp Line: 1340
Image: /root/helix/work/correlation/dotnet
cc @dotnet/jit-contrib