[PATCH 4.4 175/193] x86: Implement array_index_mask_nospec

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Dan Williams (cherry picked from commit babdde2698d482b6c0de1eab4f697cf5856c5859) array_index_nospec() uses a mask to sanitize user controllable array indexes, i.e.

[PATCH 4.4 175/193] x86: Implement array_index_mask_nospec

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Dan Williams (cherry picked from commit babdde2698d482b6c0de1eab4f697cf5856c5859) array_index_nospec() uses a mask to sanitize user controllable array indexes, i.e. generate a 0 mask if