[lld] lld: add support for NOCROSSREFS(_TO) (PR #95714)

[Daniel Thornburgh via llvm-commits]

================
@@ -2358,3 +2358,52 @@ template void elf::scanRelocations<ELF32LE>();
 template void elf::scanRelocations<ELF32BE>();
 template void elf::scanRelocations<ELF64LE>();
 template void elf::scanRelocations<ELF64BE>();
+
+static void forEachAllocInputSectionDescription(
+    ArrayRef<OutputSection *> outputSections,
+    llvm::function_ref<void(OutputSection *, InputSectionDescription *)> fn) {
+  for (OutputSection *os : outputSections) {
+    if (!(os->flags & SHF_ALLOC))
+      continue;
+    for (SectionCommand *bc : os->commands)
+      if (auto *isd = dyn_cast<InputSectionDescription>(bc))
+        fn(os, isd);
+  }
+}
+
+static void checkSectionNoCrossRefs(OutputSection *outSec,
+                                    InputSectionDescription *inSecDescr) {
+
+  std::string message = "";
+
+  for (const auto &list : script->noCrossRefLists) {
+    if (!list.matchesRefFromSection(outSec)) {
+      continue;
+    }
+
+    for (const auto &inSection : inSecDescr->sections) {
+      for (const auto &relocation : inSection->relocations) {
+        if (auto *destOutSec = relocation.sym->getOutputSection()) {
----------------
mysterymath wrote:

```suggestion
        auto *destOutSec = relocation.sym->getOutputSection());
        if (!destOutSec)
          continue;
```

https://github.com/llvm/llvm-project/pull/95714