[SIMD] Fix d8 crashes when constructing simd128 typed array without simd flag

The simd128 typed array constructors should be guarded by simd-object
runtime flag.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1250
(cherry picked from commit 3f182b6c275433eada3970f28bd8b42d9b15c5b0)
Merge pull request #14 from huningxin/crosswalk-5/34.0.1847.45

[SIMD] Fix d8 crashes when constructing simd128 typed array without simd...