[llvm] [AArch64] Bugfix when using execute-only and memtag sanitizer together (PR #133084)

[Csanád Hajdú via llvm-commits]

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@@ -511,11 +511,17 @@ void AArch64TargetELFStreamer::finish() {
       })) {
     auto *Text =
         static_cast<MCSectionELF *>(Ctx.getObjectFileInfo()->getTextSection());
-    for (auto &F : *Text)
-      if (auto *DF = dyn_cast<MCDataFragment>(&F))
-        if (!DF->getContents().empty())
-          return;
-    Text->setFlags(Text->getFlags() | ELF::SHF_AARCH64_PURECODE);
+    bool Empty = true;
+    for (auto &F : *Text) {
+      if (auto *DF = dyn_cast<MCDataFragment>(&F)) {
+        if (!DF->getContents().empty()) {
+          Empty = false;
+          break;
+        }
+      }
+    }
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Il-Capitano wrote:

I wanted to do that too, but I get the following error:
```
error: no matching function for call to '__iterator_category'
note: candidate template ignored: substitution failure [with _Iter = llvm::MCSection::iterator]: no type named 'iterator_category' in 'std::iterator_traits<llvm::MCSection::iterator>'
```
To me it looks like `MCSection::iterator` is not a proper iterator according to the standard library, so we can't use `std::all_of` (which `llvm::all_of` uses).

https://github.com/llvm/llvm-project/pull/133084