check architecture before attempting to load object files

If a user somehow manages to trick ghci into loading a .o file for the wrong architecture (e.g. arm vs x86), the runtime linker doesn't notice and tries to load it anyway. That is likely to result in a confusing error or crash.

ocVerifyImage_ELF does already check the "ELF class", which amounts to 32-bit vs 64-bit. It should also check the architecture and, I think, endianness to make sure they are compatible with the running process.

Trac metadata

Trac field	Value
Version	8.0.1-rc1
Type	Bug
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Runtime System (Linker)
Test case
Differential revisions
BlockedBy
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Blocking
CC
Operating system
Architecture