protected AbstractAssemblyResolvedBackfillBuilder<?> copyBuilder() {
		var builder = factory.newBackfillBuilder();
		builder.description = description;
		builder.exp = exp;
		builder.goal = goal;
		builder.inslen = inslen;
		builder.offset = offset;
		return builder;
	}
A {@link AssemblyResolution} indicating the need to solve an expression in the future

<p>
Such records are collected within a {@link AssemblyResolvedPatterns} and then solved just before
the final result(s) are assembled. This is typically required by instructions that refer to the
{@code inst_next} symbol.

<p>
<b>NOTE:</b> These are used internally. The user ought never to see these from the assembly API.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/sem/DefaultAssemblyResolvedBackfill.java