Precise GC: Add NYIs for functions with missing info
Precise GC: Add NYIs for functions with missing info

GcInfo encoder doesn't yet report certain data in the
GCInfo headers.

1) Generic Context slot: #766
2) Security Object Slot: #767
3) GSCookie slot: #768

This change adds exclusions for functions containing (1) and (2)
when compiling for Precise GC.

There is no exclusion for (3) because stack protection checks are
yet to be implemented in LLILC #353

kyulee1/llilcjit,dkorolev/llilc,BruceForstall/llilc,dotnet/llilc,dkorolev/llilc,BruceForstall/llilc,AndyAyersMS/llilc,russellhadley/llilc,dotnet/llilc,JosephTremoulet/llilc,AndyAyersMS/llilc,kyulee1/llilcjit,JosephTremoulet/llilc,JosephTremoulet/llilc,manu-silicon/llilc,dkorolev/llilc,adiaaida/llilc,manu-silicon/llilc,marksantos/llilc,adiaaida/llilc,marksantos/llilc,manu-silicon/llilc,BruceForstall/llilc,marksantos/llilc,russellhadley/llilc,kyulee1/llilcjit,adiaaida/llilc,russellhadley/llilc,dotnet/llilc,swaroop-sridhar/llilc,swaroop-sridhar/llilc,swaroop-sridhar/llilc,AndyAyersMS/llilc