Fix pow(a,b) overload resolution under llvm19 #4381

Job	Run time
fwd tests and non-fun mix tests	30s
fwd tests and non-fun mix tests	1h 2m 25s
prim and rev tests	13m 39s
prim and rev tests	2h 55m 43s
mix/fun tests 1	13m 38s
mix/fun tests 1	2h 17m 36s
mix/fun tests 2	13m 39s
mix/fun tests 2	1h 33m 14s
	8h 30m 24s

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