Backed out 12 changesets (bug 1366502) for causing intermittent QuantumRender...

Backed out 12 changesets (bug 1366502) for causing intermittent QuantumRender debug crashtest crashes on a CLOSED TREE.

Backed out changeset 42350bacb0bc (bug 1366502)
Backed out changeset 7f98b7f60e58 (bug 1366502)
Backed out changeset 265e39153027 (bug 1366502)
Backed out changeset cf598918bb1b (bug 1366502)
Backed out changeset e2f21ee861e5 (bug 1366502)
Backed out changeset f7fcc15d8f90 (bug 1366502)
Backed out changeset 22408b6a1ad1 (bug 1366502)
Backed out changeset 8846dac9ee35 (bug 1366502)
Backed out changeset d5225d81b832 (bug 1366502)
Backed out changeset 82f5a21b53a6 (bug 1366502)
Backed out changeset 2b20aebef47d (bug 1366502)
Backed out changeset 95f4d82e3d79 (bug 1366502)