trunk/129e6f1d40be5e428a664436d97803f70aa747c0: [inductor] Enable MXFP8 nested-reduction test on XPU (#194864)

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I reviewed this AI-assisted description and confirmed it reflects the final implementation. Summary test_rmsnorm_mxfp8_scale_swizzle_kernel_form was disabled on XPU because its helper directly called the private, SM100-only cvt_e8m0_rceil prim. This change keeps that prim and its lowering unchanged. The test helper now: uses Inline ASM HOP for the SM100 E8M0 conversion on CUDA; uses ordinary tensor bit operations fo…

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