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

[Jinsong Ji via llvm-commits]

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@@ -178,8 +178,9 @@ uint64_t Symbol::getGotPltVA() const {
 
 uint64_t Symbol::getGotPltOffset() const {
   if (isInIplt)
-    return getPltIdx() * target->gotEntrySize;
-  return (getPltIdx() + target->gotPltHeaderEntriesNum) * target->gotEntrySize;
+    return getPltIdx() * (uint64_t)target->gotEntrySize;
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jsji wrote:

1468970 [Unintentional integer overflow](https://scan6.scan.coverity.com/doc/en/cov_checker_ref.html#static_checker_OVERFLOW_BEFORE_WIDEN)
The expression's value may not be what the programmer intended, because the expression is evaluated using a narrow (i.e. few bits) integer type.

In lld::​elf::​Symbol::​getGotPltOffset(): An integer overflow occurs, with the result converted to a wider integer type ([CWE-190](http://cwe.mitre.org/data/definitions/190.html))

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