[llvm] [Exegesis] Add supports to serialize/deserialize object files into benchmarks (PR #121993)

[Aiden Grossman via llvm-commits]

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+# RUN: llvm-exegesis -mtriple=riscv64 -mcpu=sifive-p470 --opcode-name=SH3ADD --benchmark-phase=assemble-measured-code --mode=latency --benchmarks-file=%t.yaml
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boomanaiden154 wrote:

I'm thinking we might want to add a new flag that controls the emission of `object_file`? I would prefer not to have it when messing around with exegesis.

I've been wanting to do the same thing with the `assembled_snippet` output for a while given I don't find it particularly useful and it reduces performance (another round trip through the MCJIT/assembler), but that's a separate thing.

https://github.com/llvm/llvm-project/pull/121993