[clang][bytecode][NFC] Remove a useless local variable (#152711)

We can just check NonNullArgs.empty().

Author: tbaederr

clang/lib/AST/ByteCode/Compiler.cpp

@@ -2063,12 +2063,9 @@ bool Compiler<Emitter>::visitCallArgs(ArrayRef<const Expr *> Args,
                                       const FunctionDecl *FuncDecl,
                                       bool Activate) {
   assert(VarScope->getKind() == ScopeKind::Call);
-  bool HasNonNullAttr = false;
   llvm::BitVector NonNullArgs;
-  if (FuncDecl && FuncDecl->hasAttr<NonNullAttr>()) {
-    HasNonNullAttr = true;
+  if (FuncDecl && FuncDecl->hasAttr<NonNullAttr>())
     NonNullArgs = collectNonNullArgs(FuncDecl, Args);
-  }
 
   unsigned ArgIndex = 0;
   for (const Expr *Arg : Args) {
@@ -2094,7 +2091,7 @@ bool Compiler<Emitter>::visitCallArgs(ArrayRef<const Expr *> Args,
         return false;
     }
 
-    if (HasNonNullAttr && NonNullArgs[ArgIndex]) {
+    if (!NonNullArgs.empty() && NonNullArgs[ArgIndex]) {
       PrimType ArgT = classify(Arg).value_or(PT_Ptr);
       if (ArgT == PT_Ptr) {
         if (!this->emitCheckNonNullArg(ArgT, Arg))