@Nullable
	public ClassInfo getPreMappingClass(@Nonnull String postMappingName) {
		ClassPathNode preMappingPath = getPreMappingPath(postMappingName);
		if (preMappingPath == null) return null;
		return preMappingPath.getValue();
	}
@param postMappingName
		Post-mapping name.

@return Pre-mapped class info.
May be {@code null} if no the given post-mapped name was not present in the mapping operation output.
recaf-core/src/main/java/software/coley/recaf/services/mapping/MappingResults.java