Merge "Defer dexpreopt failure with missing implementation jar" am: 9d373d8c

func toJsonClassLoaderContextRec(clcs []*ClassLoaderContext) []*jsonClassLoaderContext {

	jClcs := make([]*jsonClassLoaderContext, len(clcs))

	for i, clc := range clcs {

		var host string

		if clc.Host == nil {

			// Defer build failure to when this CLC is actually used.

			host = fmt.Sprintf("implementation-jar-for-%s-is-not-available.jar", clc.Name)

		} else {

			host = clc.Host.String()

		}

		jClcs[i] = &jsonClassLoaderContext{

			Name:        clc.Name,

			Optional:    clc.Optional,

			Implicit:    clc.Implicit,

			Host:        clc.Host.String(),

			Host:        host,

			Device:      clc.Device,

			Subcontexts: toJsonClassLoaderContextRec(clc.Subcontexts),

		}