[NVPTX] Improve support for rsqrt.approx (#89417)
Complete support for rsqrt.approx with rsqrt.approx.f64 ([PTX ISA 9.7.3.17. Floating Point Instructions: rsqrt.approx.ftz.f64](https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#floating-point-instructions-rsqrt-approx-ftz-f64)). Additionally, add support for folding `sqrt` into `rsqrt`, with an optional flag to disable.
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