Read target-abi from the first bitcode file for LTO #543
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The current tests don't actually include the function in the output file. I found this while trying to debug a LTO crash for CHERI-RISC-V that wasn't reproducible with these tests until I changed them to actually emit the function code. We could also override the entry symbol, but changing the LLVM IR function name to _start seemed simpler.
This is done in a rather ugly way inside createTargetMachine(): when the Config object is created, we haven't read the first llvm::Module yet so we create a copy of the TargetOptions and update the ABIName there.
In the case of LTO invoked directly via LLD we might not have a valid features string, so fall back to reading the ABI.
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Not exactly a clean approach but seems to work.