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

Author: joker-eph

mlir/unittests/Target/LLVM/SerializeNVVMTarget.cpp

@@ -85,7 +85,7 @@ TEST_F(MLIRTargetLLVMNVVM, SKIP_WITHOUT_NVPTX(SerializeNVVMMToLLVM)) {
         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()),
@@ -121,7 +121,7 @@ TEST_F(MLIRTargetLLVMNVVM, SKIP_WITHOUT_NVPTX(SerializeNVVMToPTX)) {
         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("nvvm_kernel"));
@@ -151,6 +151,6 @@ TEST_F(MLIRTargetLLVMNVVM, SKIP_WITHOUT_NVPTX(SerializeNVVMToBinary)) {
         serializer.serializeToObject(gpuModule, options);
     // Check that the serializer was successful.
     ASSERT_TRUE(object != std::nullopt);
-    ASSERT_TRUE(object->size() > 0);
+    ASSERT_TRUE(!object->empty());
   }
 }