[lld] [LLD] Use uint64_t timestamp to overcome potential overflow (PR #81665)

[Fangrui Song via llvm-commits]

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@@ -1714,7 +1714,8 @@ void elf::postScanRelocations() {
         if (!sym.isDefined()) {
           replaceWithDefined(sym, *in.plt,
                              target->pltHeaderSize +
-                                 target->pltEntrySize * sym.getPltIdx(),
+                                 (uint64_t)target->pltEntrySize *
+                                     sym.getPltIdx(),
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MaskRay wrote:

This seems an unnecessary change. PLT entries are expected to small, much smaller than 2GiB.
If we really want to do something, we could add a check `PltSection::addEntry`, but that feels quite unnecessary.

https://github.com/llvm/llvm-project/pull/81665