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Extend int128.h to support more numeric code.
This adds a few more functions to int128.h, allowing more of numeric.c to use 128-bit integers on all platforms. Specifically, int64_div_fast_to_numeric() and the following aggregate functions can now use 128-bit integers for improved performance on all platforms, rather than just platforms with native support for int128: - SUM(int8) - AVG(int8) - STDDEV_POP(int2 or int4) - STDDEV_SAMP(int2 or int4) - VAR_POP(int2 or int4) - VAR_SAMP(int2 or int4) In addition to improved performance on platforms lacking native 128-bit integer support, this significantly simplifies this numeric code by allowing a lot of conditionally compiled code to be deleted. A couple of numeric functions (div_var_int64() and sqrt_var()) still contain conditionally compiled 128-bit integer code that only works on platforms with native 128-bit integer support. Making those work more generally would require rolling our own higher precision 128-bit division, which isn't supported for now. Author: Dean Rasheed <dean.a.rasheed@gmail.com> Reviewed-by: John Naylor <johncnaylorls@gmail.com> Discussion: https://postgr.es/m/CAEZATCWgBMc9ZwKMYqQpaQz2X6gaamYRB+RnMsUNcdMcL2Mj_w@mail.gmail.com
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