[llvm] [BOLT][RISCV] Don't read .rela.plt twice when DT_RELA aliases DT_JMPREL (PR #211201)

[via llvm-commits]

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@@ -2731,6 +2731,14 @@ void RewriteInstance::processDynamicRelocations() {
     }
   }
 
+  // On RISC-V, DT_RELA aliases DT_JMPREL when .rela.dyn is empty. Skip it to
+  // avoid reading .rela.plt twice.
+  if (DynamicRelocationsAddress && PLTRelocationsAddress &&
+      *DynamicRelocationsAddress == *PLTRelocationsAddress) {
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WangJee wrote:

In my opinion, although this currently only shows up on RISC-V, it isn't conceptually RISC-V specific: if any target ever emits DT_RELA aliasing DT_JMPREL, skipping the duplicate read is the correct behavior there too.

https://github.com/llvm/llvm-project/pull/211201