[llvm] [BOLT][RISCV] Add target symbolizer for relocations (PR #217944)

[Craig Topper via llvm-commits]

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+## Check that R_RISCV_GOT_HI20 relocations are re-encoded correctly when the
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topperc wrote:

This comment is phrased slightly differently than the reloc-got-moved-rv32.s

https://github.com/llvm/llvm-project/pull/217944