[lld] [lld][ELF] Allow `.data.rel.ro.unlikely` to be RELRO (PR #148920)

[Fangrui Song via llvm-commits]

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@@ -553,6 +553,22 @@ template <class ELFT> void Writer<ELFT>::addSectionSymbols() {
   }
 }
 
+// Returns true if the section is a data section that's read only and
+// relocatable per its section name.
+static bool isRelRoDataSection(Ctx &ctx, StringRef SectionName) {
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MaskRay wrote:

`secName`

`if (!secName.consume_front(".data.rel.ro")) return false;` then check .hot or .unlikely

This is more efficient.

https://github.com/llvm/llvm-project/pull/148920