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[Matrix] Add __builtin_matrix_column_store to Clang.

Authored by fhahn on Jun 18 2020, 2:49 AM.

Description

[Matrix] Add __builtin_matrix_column_store to Clang.

This patch add __builtin_matrix_column_major_store to Clang,
as described in clang/docs/MatrixTypes.rst. In the initial version,
the stride is not optional yet.

Reviewers: rjmccall, jfb, rsmith, Bigcheese

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D72782