[compiler] Fix some -Wshadow warnings

Bug: v8:12244,v8:12245
Change-Id: Ic609c486fddcdb9b8171f013eb400dd74926d871
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3213142Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77325}

src/compiler/bytecode-analysis.cc

@@ -548,9 +548,8 @@ void BytecodeAnalysis::Analyze() {
       next_bytecode_in_liveness = switch_liveness.in;
       for (--iterator; iterator.IsValid(); --iterator) {
         Bytecode bytecode = iterator.current_bytecode();
-        int current_offset = iterator.current_offset();
         BytecodeLiveness const& liveness =
-            liveness_map().GetLiveness(current_offset);
+            liveness_map().GetLiveness(iterator.current_offset());
 
         // There shouldn't be any more loops.
         DCHECK_NE(bytecode, Bytecode::kJumpLoop);

src/compiler/bytecode-graph-builder.cc

@@ -4328,9 +4328,9 @@ Node* BytecodeGraphBuilder::MakeNode(const Operator* op, int value_input_count,
       int context_index = exception_handlers_.top().context_register_;
       interpreter::Register context_register(context_index);
       Environment* success_env = environment()->Copy();
-      const Operator* op = common()->IfException();
+      const Operator* if_exception = common()->IfException();
       Node* effect = environment()->GetEffectDependency();
-      Node* on_exception = graph()->NewNode(op, effect, result);
+      Node* on_exception = graph()->NewNode(if_exception, effect, result);
       Node* context = environment()->LookupRegister(context_register);
       environment()->UpdateControlDependency(on_exception);
       environment()->UpdateEffectDependency(on_exception);