[llvm] [Exegesis] Implemented strategy for load operation (PR #113458)

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AnastasiyaChernikova wrote:

Yes, this is part of #89047, which was asked to be discussed in this comment (https://github.com/llvm/llvm-project/pull/89047#discussion_r1731617185). This only affects boot support for riscv, it doesn't change anything on other platforms (I looked at the --opcode-index=-1 entries in the add code for all supported architectures). Since the commit with riscv support hasn't been pushed yet, I can't add tests here.

https://github.com/llvm/llvm-project/pull/113458