Insert a C label for associated with an escapemark

Property definitions

nitc $ JavaCompilerVisitor :: add_escape_label
	# Insert a C label for associated with an escapemark
	fun add_escape_label(e: nullable EscapeMark) do
		if e == null then return
		if e.escapes.is_empty then return
		add("BREAK_{escapemark_name(e)}: ")
	end
src/compiler/java_compiler.nit:408,2--413,4