[RISCV][NFC] Change interface of RVVIntrinsic::getSuffixStr

This NFC patch is splited from D111617.

Using llvm::ArrayRef rather than llvm::SmallVector, ArrayRef is more generic
interface that could accept both llvm::ArrayRef and llvm::SmallVector.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D125893

clang/include/clang/Support/RISCVVIntrinsicUtils.h

@@ -340,9 +340,9 @@ class RVVIntrinsic {
   // Return the type string for a BUILTIN() macro in Builtins.def.
   std::string getBuiltinTypeStr() const;
 
-  static std::string getSuffixStr(
-      BasicType Type, int Log2LMUL,
-      const llvm::SmallVector<PrototypeDescriptor> &PrototypeDescriptors);
+  static std::string
+  getSuffixStr(BasicType Type, int Log2LMUL,
+               llvm::ArrayRef<PrototypeDescriptor> PrototypeDescriptors);
 };
 
 } // end namespace RISCV

clang/lib/Support/RISCVVIntrinsicUtils.cpp

@@ -922,7 +922,7 @@ std::string RVVIntrinsic::getBuiltinTypeStr() const {
 
 std::string RVVIntrinsic::getSuffixStr(
     BasicType Type, int Log2LMUL,
-    const llvm::SmallVector<PrototypeDescriptor> &PrototypeDescriptors) {
+    llvm::ArrayRef<PrototypeDescriptor> PrototypeDescriptors) {
   SmallVector<std::string> SuffixStrs;
   for (auto PD : PrototypeDescriptors) {
     auto T = RVVType::computeType(Type, Log2LMUL, PD);