[RISCV] Support Parsing Nonstandard Relocations (#119909) This allows nonstandard relocation names to be used in `.reloc` assembly directives (giving the correct relocation number). No translation is done by the assembler into `R_RISCV_CUSTOM<n>` names, and the assembler does not automatically add the relevant `R_RISCV_VENDOR` relocation with the vendor symbol. If we want, we can have a different directive that does this later. The first batch of relocations to be added are from [Qualcomm's RISC-V psABI extensions](https://github.com/quic/riscv-elf-psabi-quic-extensions/releases/tag/v0.1).
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