Backed out 12 changesets (bug 927782) for SM rootanalysis orange.

Backed out changeset f86d2d4cfadf (bug 927782)
Backed out changeset 51d6617835d1 (bug 927782)
Backed out changeset eed9795fa80e (bug 927782)
Backed out changeset b971de7edfff (bug 927782)
Backed out changeset 5f086f95b305 (bug 927782)
Backed out changeset 8c74b1f68590 (bug 927782)
Backed out changeset f1237f11edcd (bug 927782)
Backed out changeset d6946bd743b3 (bug 927782)
Backed out changeset cbdd50c96b85 (bug 927782)
Backed out changeset fc7a979712fc (bug 927782)
Backed out changeset c8304ccf88e9 (bug 927782)
Backed out changeset 9d99e9ca7b32 (bug 927782)
Bug 946883 - Use NSPR thread for AsmJSMachExceptionHandler on OS X, so that it works with PosixNSPR. r=luke

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extra : rebase_source : 34a82b93197c14ab237df23ceb8646499049cbf8