Remove ReasoningBasedSimplifier from libyul

Due to a design decision to move away from a bundled SMT solver,
ReasoningBasedSimplifier in its current form cannot be use any longer.
This is a necessary step to allow a unified way to call solvers using
only SMTLIB interface.

Since this optimization pass has always been marked as highly
experimental and never turned on by default, it should be OK to remove
it.

test/libyul/YulOptimizerTest.cpp

@@ -24,7 +24,6 @@
 #include <test/Common.h>
 
 #include <libyul/Object.h>
-#include <libyul/optimiser/ReasoningBasedSimplifier.h>
 #include <libyul/AsmPrinter.h>
 
 #include <liblangutil/CharStreamProvider.h>
@@ -53,12 +52,6 @@ YulOptimizerTest::YulOptimizerTest(string const& _filename):
 		BOOST_THROW_EXCEPTION(runtime_error("Filename path has to contain a directory: \"" + _filename + "\"."));
 	m_optimizerStep = std::prev(std::prev(path.end()))->string();
 
-	if (m_optimizerStep == "reasoningBasedSimplifier" && (
-		solidity::test::CommonOptions::get().disableSMT ||
-		ReasoningBasedSimplifier::invalidInCurrentEnvironment()
-	))
-		m_shouldRun = false;
-
 	m_source = m_reader.source();
 
 	auto dialectName = m_reader.stringSetting("dialect", "evm");