Use std::string_view in torchgen

[cyyever]

Let the generated code use std::sv

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UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / cuda12.8-py3.10-gcc9-sm75 / test (pr_time_benchmarks, 1, 1, linux.g4dn.metal.nvidia.gpu, unstable) (gh) (#153987)
  MISSING REGRESSION TEST

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[ezyang]

@pytorchbot merge

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[jeanschmidt]

@pytorchbot revert -m "Seems to have broken internal builds, more details on D77449943. @ezyang may I count on your help to get those changes merged?"

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[jeanschmidt]

@pytorchbot revert -m "Seems to have broken internal builds, more details on D77449943. @ezyang may I count on your help to get those changes merged?" -c ghfirst

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@cyyever your PR has been successfully reverted.

[cyyever]

@jeanschmidt @ezyang I have no permission to see the report, but could they be fixed by simply using std::string_view?