Adjust MemSet macro to use size_t rather than long

Likewise for MemSetAligned.

"long" wasn't the most suitable type for these macros as with MSVC in
64-bit builds, sizeof(long) == 4, which is narrower than the processor's
word size, therefore these macros had to perform twice as many loops as
they otherwise might.

Author: David Rowley <[email protected]>
Reviewed-by: Heikki Linnakangas <[email protected]>
Reviewed-by: Peter Eisentraut <[email protected]>
Discussion: 
https://postgr.es/m/CAApHDvoGFjSA3aNyVQ3ivbyc4ST=cc5l-_vjeuq92hbe2cx...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/586d63214e369283472b5c03fdbaf59833209b3e

Modified Files
--------------
src/include/c.h | 38 +++++++++++++++++++-------------------
1 file changed, 19 insertions(+), 19 deletions(-)

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