[llvm-mca] Use llvm::erase_if (NFC) (llvm#96029)

Author: kazutakahirata

llvm/tools/llvm-mca/CodeRegion.h

@@ -104,11 +104,9 @@ class CodeRegion {
   dropInstructions(const llvm::SmallPtrSetImpl<const llvm::MCInst *> &Insts) {
     if (Insts.empty())
       return Instructions;
-    Instructions.erase(std::remove_if(Instructions.begin(), Instructions.end(),
-                                      [&Insts](const llvm::MCInst &Inst) {
-                                        return Insts.contains(&Inst);
-                                      }),
-                       Instructions.end());
+    llvm::erase_if(Instructions, [&Insts](const llvm::MCInst &Inst) {
+      return Insts.contains(&Inst);
+    });
     return Instructions;
   }