T15633b is fragile on Windows

In !1130 (closed) I saw one build where T15633b failed segfaulted on Windows:

Wrong exit code for T15633b(ghci)(expected 0 , actual 11 )
Stdout ( T15633b ):
True
Stderr ( T15633b ):
TcPluginGHCi

Access violation in generated code when reading 0xfffffffffffffff8

 Attempting to reconstruct a stack trace...

   Frame	Code address
 * 0x54ffaf0	0x3001263 C:\GitLabRunner\builds\e963ee11\0\ghc\ghc\inplace\bin\ghc-stage2.exe+0x2c01263
 * 0x54ffb70	0x2fd578c C:\GitLabRunner\builds\e963ee11\0\ghc\ghc\inplace\bin\ghc-stage2.exe+0x2bd578c
 * 0x54ffbe0	0x2fcacbf C:\GitLabRunner\builds\e963ee11\0\ghc\ghc\inplace\bin\ghc-stage2.exe+0x2bcacbf
 * 0x54ffd30	0x2fcb63f C:\GitLabRunner\builds\e963ee11\0\ghc\ghc\inplace\bin\ghc-stage2.exe+0x2bcb63f
 * 0x54ffe20	0x2fc0270 C:\GitLabRunner\builds\e963ee11\0\ghc\ghc\inplace\bin\ghc-stage2.exe+0x2bc0270
 * 0x54ffed0	0x2fc11c7 C:\GitLabRunner\builds\e963ee11\0\ghc\ghc\inplace\bin\ghc-stage2.exe+0x2bc11c7
 * 0x54fff10	0x2fc1a4f C:\GitLabRunner\builds\e963ee11\0\ghc\ghc\inplace\bin\ghc-stage2.exe+0x2bc1a4f
 * 0x54fff50	0x2fe92f8 C:\GitLabRunner\builds\e963ee11\0\ghc\ghc\inplace\bin\ghc-stage2.exe+0x2be92f8
 * 0x54fff80	0x7ffef5d284d4 C:\Windows\System32\KERNEL32.DLL+0x84d4
 * 0x54fffd0	0x7ffef86be851 C:\Windows\SYSTEM32\ntdll.dll+0x6e851
*** unexpected failure for T15633b(ghci)

I suspect this means that either plugins or GHCi (or the combination of the two) are fragile on Windows. I'm going to mark both T15633b and T15633a as fragile on Windows.

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