Bug 1072368 - Implement the remaining SIMD integer compares in the interpreter and asm.js; a=sunfish,bbouvier, r=sunfish

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extra : histedit_source : c9a772af119b0d8d01ba5ef01653bc3a356826dc
Bug 1072368: Merge SIMD.js comparison tests in comparisons.js; r=till
Bug 1102893: Remove some SIMD.js outdated functions; r=till