[jumbo] avoid namespace collisions in wasm atomics tests

Followup to https://chromium-review.googlesource.com/c/v8/v8/+/923718

Bug: v8:6532
Change-Id: I4ed3dd94a59172a54cc5cb70730fdffba4efb383
Reviewed-on: https://chromium-review.googlesource.com/947942Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#51715}

test/cctest/wasm/test-run-wasm-atomics.cc

@@ -8,6 +8,7 @@
 namespace v8 {
 namespace internal {
 namespace wasm {
+namespace test_run_wasm_atomics {
 
 void RunU32BinOp(WasmExecutionMode execution_mode, WasmOpcode wasm_op,
                  Uint32BinOp expected_op) {
@@ -294,6 +295,7 @@ WASM_EXEC_TEST(I32AtomicStoreLoad8U) {
   }
 }
 
+}  // namespace test_run_wasm_atomics
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8

test/cctest/wasm/test-run-wasm-atomics64.cc

@@ -8,7 +8,7 @@
 namespace v8 {
 namespace internal {
 namespace wasm {
-namespace atomics_64 {
+namespace test_run_wasm_atomics_64 {
 
 void RunU64BinOp(WasmExecutionMode execution_mode, WasmOpcode wasm_op,
                  Uint64BinOp expected_op) {
@@ -158,7 +158,7 @@ WASM_COMPILED_EXEC_TEST(I64AtomicXor8U) {
   RunU8BinOp(execution_mode, kExprI64AtomicXor8U, Xor);
 }
 
-}  // namespace atomics_64
+}  // namespace test_run_wasm_atomics_64
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8