[InstCombine] Initialize a SmallVector with a range (NFC) (#100947)

Author: kazutakahirata

llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp

@@ -1500,10 +1500,7 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
   // Don't try to simplify calls without uses. It will not do anything useful,
   // but will result in the following folds being skipped.
   if (!CI.use_empty()) {
-    SmallVector<Value *, 8> Args;
-    Args.reserve(CI.arg_size());
-    for (Value *Op : CI.args())
-      Args.push_back(Op);
+    SmallVector<Value *, 8> Args(CI.args());
     if (Value *V = simplifyCall(&CI, CI.getCalledOperand(), Args,
                                 SQ.getWithInstruction(&CI)))
       return replaceInstUsesWith(CI, V);