Fixes and workarounds for "expand all" mode when run on simple bring-up tests.
Fixes and workarounds for "expand all" mode when run on simple bring-up tests.

These fixes allow us to run simple jit tests with complus_expandallonload=1.

Implicitly extend int32 to native int when popping the stack. Closes #559.

Reinterpret native int as unmanaged pointer in `getFieldAddress`. Closes #571.

Reinterpret unmanaged pointer as native int in `genConvertOverflowCheck`. Closes #555.

Bail out if we can't account for all the fields in the type. Workaround for #557.

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