[llvm] [MC] Use range-based for loops (NFC) (PR #98604)

[Fangrui Song via llvm-commits]

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@@ -699,17 +699,16 @@ void MCELFStreamer::setAttributeItems(unsigned Attribute, unsigned IntValue,
 
 MCELFStreamer::AttributeItem *
 MCELFStreamer::getAttributeItem(unsigned Attribute) {
-  for (size_t I = 0; I < Contents.size(); ++I)
-    if (Contents[I].Tag == Attribute)
-      return &Contents[I];
+  for (AttributeItem &Item : Contents)
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MaskRay wrote:

Using `llvm::find_if` requires a comparison with `Contents.end()` here and might be longer.
The for each loop LGTM.

https://github.com/llvm/llvm-project/pull/98604