Revert "Bug 946042 - Add all SIMD functions to the interpreter. r=till"

This reverts commit e0956e946a6933a60693938e5e30bdb8a437181b.
Revert "Bug 946042 - Add all SIMD functions to the interpreter. r=till"

This reverts commit efeec8c3094b8651bc168f4d69b9ddef65d15684.
Patch that landed in inbound
Merge branch 'ivan-bug946042' of https://github.com/nikomatsakis/iontrail into ivan-bug946042

Conflicts:
	js/src/builtin/SIMD.cpp