Restrict usage of plain "new".

test/libyul/EWasmTranslationTest.h

@@ -37,7 +37,7 @@ class EWasmTranslationTest: public dev::solidity::test::EVMVersionRestrictedTest
 public:
 	static std::unique_ptr<TestCase> create(Config const& _config)
 	{
-		return std::unique_ptr<TestCase>(new EWasmTranslationTest(_config.filename));
+		return std::make_unique<EWasmTranslationTest>(_config.filename);
 	}
 
 	explicit EWasmTranslationTest(std::string const& _filename);

test/libyul/FunctionSideEffects.h

@@ -34,7 +34,7 @@ class FunctionSideEffects: public dev::solidity::test::TestCase
 {
 public:
 	static std::unique_ptr<TestCase> create(Config const& _config)
-	{ return std::unique_ptr<TestCase>(new FunctionSideEffects(_config.filename)); }
+	{ return std::make_unique<FunctionSideEffects>(_config.filename); }
 	explicit FunctionSideEffects(std::string const& _filename);
 
 	TestResult run(std::ostream& _stream, std::string const& _linePrefix = "", bool const _formatted = false) override;

test/libyul/ObjectCompilerTest.h

@@ -42,7 +42,7 @@ class ObjectCompilerTest: public dev::solidity::test::TestCase
 public:
 	static std::unique_ptr<TestCase> create(Config const& _config)
 	{
-		return std::unique_ptr<TestCase>(new ObjectCompilerTest(_config.filename));
+		return std::make_unique<ObjectCompilerTest>(_config.filename);
 	}
 
 	explicit ObjectCompilerTest(std::string const& _filename);

test/libyul/YulInterpreterTest.h

@@ -42,7 +42,7 @@ class YulInterpreterTest: public dev::solidity::test::EVMVersionRestrictedTestCa
 public:
 	static std::unique_ptr<TestCase> create(Config const& _config)
 	{
-		return std::unique_ptr<TestCase>(new YulInterpreterTest(_config.filename));
+		return std::make_unique<YulInterpreterTest>(_config.filename);
 	}
 
 	explicit YulInterpreterTest(std::string const& _filename);

test/libyul/YulOptimizerTest.cpp

@@ -424,7 +424,11 @@ void YulOptimizerTest::disambiguate()
 void YulOptimizerTest::updateContext()
 {
 	m_nameDispenser = make_unique<NameDispenser>(*m_dialect, *m_ast, m_reservedIdentifiers);
-	m_context = unique_ptr<OptimiserStepContext>(new OptimiserStepContext{*m_dialect, *m_nameDispenser, m_reservedIdentifiers});
+	m_context = make_unique<OptimiserStepContext>(OptimiserStepContext{
+		*m_dialect,
+		*m_nameDispenser,
+		m_reservedIdentifiers
+	});
 }
 
 void YulOptimizerTest::printErrors(ostream& _stream, ErrorList const& _errors)

test/libyul/YulOptimizerTest.h

@@ -51,7 +51,7 @@ class YulOptimizerTest: public dev::solidity::test::EVMVersionRestrictedTestCase
 public:
 	static std::unique_ptr<TestCase> create(Config const& _config)
 	{
-		return std::unique_ptr<TestCase>(new YulOptimizerTest(_config.filename));
+		return std::make_unique<YulOptimizerTest>(_config.filename);
 	}
 
 	explicit YulOptimizerTest(std::string const& _filename);