Apply clang-tidy fixes for readability-container-size-empty in SerializeROCDLTarget.cpp (NFC)

Author: joker-eph

mlir/unittests/Target/LLVM/SerializeROCDLTarget.cpp

@@ -89,7 +89,7 @@ TEST_F(MLIRTargetLLVMROCDL, SKIP_WITHOUT_AMDGPU(SerializeROCDLMToLLVM)) {
         serializer.serializeToObject(gpuModule, options);
     // Check that the serializer was successful.
     ASSERT_TRUE(object != std::nullopt);
-    ASSERT_TRUE(object->size() > 0);
+    ASSERT_TRUE(!object->empty());
 
     // Read the serialized module.
     llvm::MemoryBufferRef buffer(StringRef(object->data(), object->size()),
@@ -125,7 +125,7 @@ TEST_F(MLIRTargetLLVMROCDL, SKIP_WITHOUT_AMDGPU(SerializeROCDLToPTX)) {
         serializer.serializeToObject(gpuModule, options);
     // Check that the serializer was successful.
     ASSERT_TRUE(object != std::nullopt);
-    ASSERT_TRUE(object->size() > 0);
+    ASSERT_TRUE(!object->empty());
 
     ASSERT_TRUE(
         StringRef(object->data(), object->size()).contains("rocdl_kernel"));