[llvm-mca] Drop const from a return type (NFC) (#140836)

Author: kazutakahirata

llvm/tools/llvm-mca/CodeRegion.cpp

@@ -158,7 +158,7 @@ void InstrumentRegions::endRegion(StringRef Description, SMLoc Loc) {
   }
 }
 
-const SmallVector<Instrument *>
+SmallVector<Instrument *>
 InstrumentRegions::getActiveInstruments(SMLoc Loc) const {
   SmallVector<Instrument *> AI;
   for (auto &R : Regions) {

llvm/tools/llvm-mca/CodeRegion.h

@@ -210,7 +210,7 @@ struct InstrumentRegions : public CodeRegions {
                    UniqueInstrument Instrument) override;
   void endRegion(llvm::StringRef Description, llvm::SMLoc Loc) override;
 
-  const SmallVector<Instrument *> getActiveInstruments(llvm::SMLoc Loc) const;
+  SmallVector<Instrument *> getActiveInstruments(llvm::SMLoc Loc) const;
 };
 
 } // namespace mca