Commits on Apr 19, 2018

1. Fix nested spin locks in thread pool etw firing …

   `UnManagedPerAppDomainTPCount::QueueUnmanagedWorkRequest` fires an ETW event inside a spin lock and a nested spin lock is taken here:
   
   ```
   SpinLock::GetLock + 0x8E (0x719da71d)
   EventPipeBufferManager::AllocateBufferForThread + 0x7B (0x71afa92e)
   EventPipeBufferManager::WriteEvent + 0x250 (0x71afbe0a)
   EventPipe::WriteEventInternal + 0x125 (0x71951c93)
   EventPipe::WriteEvent + 0x91 (0x71951714)
   EventPipeWriteEventThreadPoolEnqueue + 0x9E (0x71d468a6)
   FireEtwThreadPoolEnqueue + 0xF (0x71b7a04b)
   UnManagedPerAppDomainTPCount::QueueUnmanagedWorkRequest + 0x21D (0x71b7a597)
   ```
   
   Nesting spin locks is not allowed, moved the ETW firing outside the lock.

   

   kouvel committed Apr 19, 2018
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