Fix concurrency bug in bottom-up resolution walk.

Concurrency is hard, and now that we no longer track origin it doesn't
improve performance in any meaningful way.

Bug: 261787132

Test: m droid dist compliance_dumpgraph compliance_dumpresolutions \
        compliance_sbom compliance_listshare compliance_rtrace \
        compliance_checkshare xmlnotice textnotice htmlnotice \
        compliancenotice_shippedlibs compliancenotice_bom

Test: m compliance_checkshare cts && \
        out/host/linux-x86/bin/compliance_checkshare out/host/linux-x86/gen/META/lic_intermediates/out/host/linux-x86/cts/android-cts.zip.meta_lic

Test: similar command as above for gts on internal

Test: m compliance_checksare droid dist && \
        out/host/linux-x86/bin/compliance_checkshare out/target/product/sunfish/gen/META/lic_intermediates/out/target/product/sunfish/obj/PACKAGING/systemimage_intermediates/system.img.meta_lic

Change-Id: I57a75927bf879c3ce6603049d8d583211dc0ce29