[NFC][RISCV] Simplify the dynamic linker construction logic

The format of dynamic linker is `ld-linux-{arch}-{abi}.so.1`, so
we can just get the arch name from arch type.

Reviewers: asb, kito-cheng, MaskRay

Reviewed By: MaskRay

Pull Request: #97383

Author: wangpc-pp

clang/lib/Driver/ToolChains/Linux.cpp

@@ -568,16 +568,12 @@ std::string Linux::getDynamicLinker(const ArgList &Args) const {
     Loader =
         (tools::ppc::hasPPCAbiArg(Args, "elfv1")) ? "ld64.so.1" : "ld64.so.2";
     break;
-  case llvm::Triple::riscv32: {
-    StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple);
-    LibDir = "lib";
-    Loader = ("ld-linux-riscv32-" + ABIName + ".so.1").str();
-    break;
-  }
+  case llvm::Triple::riscv32:
   case llvm::Triple::riscv64: {
+    StringRef ArchName = llvm::Triple::getArchTypeName(Arch);
     StringRef ABIName = tools::riscv::getRISCVABI(Args, Triple);
     LibDir = "lib";
-    Loader = ("ld-linux-riscv64-" + ABIName + ".so.1").str();
+    Loader = ("ld-linux-" + ArchName + "-" + ABIName + ".so.1").str();
     break;
   }
   case llvm::Triple::sparc: