Fix indexing overflow issue for blockwise quantization on AMD #1796
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This PR ports the changes from #1784 to kernels.hip and ops.hip so that the newly added test_dynamic_blockwise_quantization_large test can pass on AMD GPUs. Without this change the test gets aborted.
Tested this on both W7900 (gfx1100) and R9700 (gfx1201) and all 3 unit tests passed successfully.