DRace crashes on skylake+CLR if HeapAlloc is wrapped

[fmoessbauer]

This crash only occurs on a server with a skylake processor:
OS: Windows 10 Enterprise, 10.0.17134
CPU: Intel Xeon Silver 4116
RAM: 80 GB

on a similar system with Kaby Lake Refresh arch, the bug does not happen.
OS: Windows 10 Enterprise, 10.0.17134
CPU: Intel Core i5-8350U
RAM: 16 GB

# RetAddr           : Args to Child                                                           : Call Site
00 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : 0x0

The crash is reproducible using this application and happens here:
https://github.com/siemens/drace/blob/master/test/mini-apps/cs-sync/main.cs#L115

The crash is not directly related to DRace, but might be an DR issue. Running the wrap sample client also crashes:

C:\opt\DynamoRIO-Windows-7.91.18219-0\bin64\drrun.exe -c C:\opt\DynamoRIO-Windows-7.91.18219-0\samples\bin64\wrap.dll -- gp-cs-sync-clr.exe monitor

Workaround: comment out the line containing HeapAlloc in drace.ini

Probably related issues:

• Make MAX_CONTEXT_SIZE dynamically sized to future-proof it DynamoRIO/dynamorio#2666 (mentioned assertion fires)