X87: VectorICs: New interface descriptor for vector transitioning stores.
X87: VectorICs: New interface descriptor for vector transitioning stores.

port cd35155918f8f1a081a208721a878deba00a252b (r30284).

original commit message:

BUG=

Review URL: https://codereview.chromium.org/1303223002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#30297}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh