[BOLT][RISCV] Avoid evaluating indirect branches as direct branches (#218088) The RISC-V branch evaluator can resolve JALR when the base register state is known. In particular, jalr zero, zero, 0 evaluates to address zero even though it remains an indirect branch. Do not send indirect branches through the direct branch symbolization path. Leave them to the existing indirect branch handling instead. Add a regression test modeling a tail call to an undefined weak symbol relaxed by GNU ld.
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