[AIE] Add FP64 support to G_FCMP legalizer (issue #431) #439
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Adds support for comparing doubles, via intrinsics like
__ledf2
incomparedf2.c
.This is basically identical to the float support, as are tests (G_MERGE_VALUES is a bit painful idk if there's a better way).
Did bonus sanity checks comparing random doubles on AIE2 hardware.