[XLA] In the QR decomposition implementation, change the Compact WY transformation to use a matrix multiplication instead of a sequence of matrix-vector multiplications in a loop.
[XLA] In the QR decomposition implementation, change the Compact WY transformation to use a matrix multiplication instead of a sequence of matrix-vector multiplications in a loop.

Happily this seems to be a case where we don't need to avoid materializing the matrix-matrix product: the output matrix is only [n, n] where n is the block size.

PiperOrigin-RevId: 331429315
Change-Id: I804296fe7b404cea231759bd67671b53c47420db

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