[VPlan] Clean up unused header (NFC) (#130599)

We use VPlanPatternMatch, and not PatternMatch: clean up the
PatternMatch include to avoid confusion.

Author: artagnon

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -27,7 +27,6 @@
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Intrinsics.h"
-#include "llvm/IR/PatternMatch.h"
 #include "llvm/IR/Type.h"
 #include "llvm/IR/Value.h"
 #include "llvm/IR/VectorBuilder.h"