[XLA] Use the compact WY representation in the implementation of blocked QR decompositions.
[XLA] Use the compact WY representation in the implementation of blocked QR decompositions.

Compact WY representations are described in:
Schreiber, Robert, and Charles Van Loan. "A storage-efficient WY representation for products of Householder transformations." SIAM Journal on Scientific and Statistical Computing 10.1 (1989): 53-57.

The compact WY representation is more storage efficient, requiring calculation of an nxn triangular matrix, where n is the block size (e.g., 128), instead of an mxn matrix where m is the number of matrix rows.

PiperOrigin-RevId: 330711085
Change-Id: Ideac239ff118ee6ac2fd1397b731a40e11d6ecd7

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