[lld] [wip][LLD] Support RISCV vendor-specific relocations. (PR #168497)

[Sam Elliott via llvm-commits]

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@@ -1533,3 +1540,21 @@ template <class ELFT> void RISCV::scanSection1(InputSectionBase &sec) {
 void RISCV::scanSection(InputSectionBase &sec) {
   invokeELFT(scanSection1, sec);
 }
+
+namespace lld::elf {
+uint32_t getRISCVVendorRelType(StringRef rvVendor) {
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lenary wrote:

Nit: This could maybe be something like the following for clarity, given it now doesn't return a type:

```suggestion
uint32_t getRISCVVendorRelMarker(StringRef rvVendor) {
```

https://github.com/llvm/llvm-project/pull/168497