[llvm] [llvm] Use llvm::size (NFC) (PR #168675)

[Kazu Hirata via llvm-commits]

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@@ -703,8 +703,7 @@ void RegisterInfoEmitter::emitComposeSubRegIndices(raw_ostream &OS,
   SmallVector<unsigned, 4> RowMap;
   SmallVector<SmallVector<const CodeGenSubRegIndex *, 4>, 4> Rows;
 
-  auto SubRegIndicesSize =
-      std::distance(SubRegIndices.begin(), SubRegIndices.end());
+  auto SubRegIndicesSize = llvm::size(SubRegIndices);
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kazutakahirata wrote:

See #168728.

https://github.com/llvm/llvm-project/pull/168675