[llvm] Add matchers m_ExtractSubvector and m_InsertSubvector (PR #120212)

[Simon Pilgrim via llvm-commits]

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@@ -802,6 +808,12 @@ inline BinaryOpc_match<LHS, RHS> m_ExtractElt(const LHS &Vec, const RHS &Idx) {
   return BinaryOpc_match<LHS, RHS>(ISD::EXTRACT_VECTOR_ELT, Vec, Idx);
 }
 
+template <typename LHS, typename RHS>
+inline BinaryOpc_match<LHS, RHS> m_ExtractSubvector(const LHS &L,
+                                                    const RHS &R) {
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RKSimon wrote:

(pedantic) replace L and R with Vec and Idx

https://github.com/llvm/llvm-project/pull/120212