[llvm] [yaml2obj][XOFF] Update yaml2obj for XCOFF to create valid XCOFF files in more cases. (PR #77620)

[James Henderson via llvm-commits]

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@@ -98,11 +98,26 @@ bool XCOFFWriter::nameShouldBeInStringTable(StringRef SymbolName) {
 bool XCOFFWriter::initRelocations(uint64_t &CurrentOffset) {
   for (XCOFFYAML::Section &InitSection : InitSections) {
     if (!InitSection.Relocations.empty()) {
-      InitSection.NumberOfRelocations = InitSection.Relocations.size();
-      InitSection.FileOffsetToRelocations = CurrentOffset;
       uint64_t RelSize = Is64Bit ? XCOFF::RelocationSerializationSize64
                                  : XCOFF::RelocationSerializationSize32;
-      CurrentOffset += InitSection.NumberOfRelocations * RelSize;
+      const uint64_t UsedSize = RelSize * InitSection.Relocations.size();
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jh7370 wrote:

Nit: the use of `const` here is a bit offputting, given it's not used for other local variables that don't change in the area. I'd probably not bother with it.

https://github.com/llvm/llvm-project/pull/77620