Introduce a number of SIMD extensions for x86/x86_64 (SSE).

Rationale:
As a first step exploring how useful an ART vectorizer may be,
introducing a number of floating-point SIMD instructions.

Test: assembler_x86[_64]_test
Bug: 34083438
Change-Id: I0285dd9fca51f31875a6bbe728f873c48089940d
6 files changed