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[Matrix] Implement * binary operator for MatrixType.

Authored by fhahn on Jun 7 2020, 3:11 AM.

Description

[Matrix] Implement * binary operator for MatrixType.

This patch implements the * binary operator for values of
MatrixType. It adds support for matrix * matrix, scalar * matrix and
matrix * scalar.

For the matrix, matrix case, the number of columns of the first operand
must match the number of rows of the second. For the scalar,matrix variants,
the element type of the matrix must match the scalar type.

Reviewers: rjmccall, anemet, Bigcheese, rsmith, martong

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D76794

Details