Return the local RuntimeVariable associated to a Nit local variable

Property definitions

nitc $ JavaCompilerVisitor :: variable
	# Return the local RuntimeVariable associated to a Nit local variable
	fun variable(variable: Variable): RuntimeVariable do
		if variables.has_key(variable) then
			return variables[variable]
		else
			var name = get_name("var_{variable.name}")
			var mtype = variable.declared_type.as(not null)
			mtype = anchor(mtype)
			var res = decl_var(name, mtype)
			variables[variable] = res
			return res
		end
	end
src/compiler/java_compiler.nit:420,2--432,4