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1cdcee26 - [HLSL][Matrix] Make matrix truncation respect default matrix memory layout (#184280)

[HLSL][Matrix] Make matrix truncation respect default matrix memory layout (#184280) Fixes #183127 and #184371 This PR makes the matrix truncation cast implementation use the new matrix flattened index helper functions introduced by #182904 so that it reads elements from the source matrix using the default matrix memory layout instead of always assuming column-major order. This PR also fixes a bug where matrix truncation truncated the wrong elements. Assisted-by: claude-opus-4.6