Stringbuilder freezes the test...

Hi.

I'm trying to benchmark two simple functions, where "Global_Var" strings with ~30 characters each.

```

Public Function SB1() As String
Public_StringBuilder.Clear()

Public_StringBuilder.Append(Global_Var1)
Public_StringBuilder.Append(Global_Var2)
Public_StringBuilder.Append(Global_Var3)
Public_StringBuilder.Append("apeas um teste de troca de valores XXX por YYY")

Return Public_StringBuilder.ToString.Replace("XXX", "DESSE TYPO X").Replace("YYY", "por ESTE AQUI")
End Function

Public Function SB2() As String
Public_StringBuilder.Clear()

Public_StringBuilder.Append(Global_Var1)
Public_StringBuilder.Append(Global_Var2)
Public_StringBuilder.Append(Global_Var3)
Public_StringBuilder.Append("apeas um teste de troca de valores XXX por YYY")

Public_StringBuilder.Replace("XXX", "DESSE TYPO X")
Public_StringBuilder.Replace("YYY", "por ESTE AQUI")

Return Public_StringBuilder.ToString
End Function

```
The problem is related to:

1- The test never ends, consuming 15%-22% of an i9-7900X w/64Gb RAM.

2- Even if I define "no WarmUp" and other settings, BDN performs them.

3- When I type CTRL-C on the CMD window, the job continues indefinitely, and I have to call Task Manager and kill it

See this print, similar to all others I got in 2 hours trying to conduct this test.


My Job parameters are:

```
ManualConfig.CreateEmpty().AddJob(Job.Default.WithRuntime(ClrRuntime.Net48) _
.WithPlatform(Platform.AnyCpu) _
.WithJit(Jit.RyuJit) _
.WithWarmupCount(0) _
.WithStrategy(RunStrategy.ColdStart) _
.WithMaxIterationCount(1) _
.WithMaxWarmupCount(0) _
.WithLaunchCount(1) _
.WithBaseline(True))

Dim summary = BenchmarkRunner.Run(Of Benchmarks)()

```

Thanks for any help...