Bug 886842 - Add clang trunk builds for ASan. r=ehsan DONTBUILD

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rename : browser/config/tooltool-manifests/linux32/clang.manifest => browser/config/tooltool-manifests/linux32/asan.manifest
rename : browser/config/tooltool-manifests/linux64/clang.manifest => browser/config/tooltool-manifests/linux64/asan.manifest
rename : browser/config/tooltool-manifests/macosx64/releng.manifest => browser/config/tooltool-manifests/macosx64/asan.manifest