[yul-phaser] ProgramSize: Add an option to repeat the optimisation sequence several times

tools/yulPhaser/FitnessMetrics.cpp

@@ -23,6 +23,8 @@ using namespace solidity::phaser;
 size_t ProgramSize::evaluate(Chromosome const& _chromosome) const
 {
 	Program programCopy = m_program;
-	programCopy.optimise(_chromosome.optimisationSteps());
+	for (size_t i = 0; i < m_repetitionCount; ++i)
+		programCopy.optimise(_chromosome.optimisationSteps());
+
 	return programCopy.codeSize();
 }

tools/yulPhaser/FitnessMetrics.h

@@ -53,12 +53,15 @@ public:
 class ProgramSize: public FitnessMetric
 {
 public:
-	ProgramSize(Program _program): m_program(std::move(_program)) {}
+	explicit ProgramSize(Program _program, size_t _repetitionCount = 1):
+		m_program(std::move(_program)),
+		m_repetitionCount(_repetitionCount) {}
 
 	size_t evaluate(Chromosome const& _chromosome) const override;
 
 private:
 	Program m_program;
+	size_t m_repetitionCount;
 };
 
 }