Turn off scalar_check for _th_normal.

[gchanan]

Stack from ghstack:

• [BC-BREAKING] change index_select scalar_check to retain dimensionality of input. #30502 [BC-BREAKING] change index_select scalar_check to retain dimensionality of input.
• Turn off scalar_checks for SpatialDepthwiseConvolution and SpatialConvolutionMM. #30438 Turn off scalar_checks for SpatialDepthwiseConvolution and SpatialConvolutionMM.
• [WIP] Remove scalar_check from topk, move it to the THC implementation. #30437 [WIP] Remove scalar_check from topk, move it to the THC implementation.
• Turn off scalar_checks for _th_reciprocal. #30436 Turn off scalar_checks for _th_reciprocal.
• Turn off scalar_checks for torch.clamp. #30435 Turn off scalar_checks for torch.clamp.
• Turn off scalar_checks for exp, cos, cosh, tan, atan, tanh, erf, erfc. #30434 Turn off scalar_checks for exp, cos, cosh, tan, atan, tanh, erf, erfc.
• Turn off scalar_check for _th_normal. #29955 Turn off scalar_check for _th_normal.

Differential Revision: D18548051

[albanD]

Should we still mark this as BC-breaking even though it's very minor?

[gchanan]

@albanD good question. In this case it's very clearly a bug and CPU did the right thing, so it doesn't seem more BC breaking than any other bug fix that people may rely on.