Fuse all pointwise inputs with mlir not just the first one found #21658

Job	Run time
Check if image exists in registry	4s
cancel	2s
licensing	3m 15s
linux (ubuntu-20.04, debug)	2h 29m 40s
linux (ubuntu-20.04, release)	1h 49m 42s
linux-fpga (ubuntu-20.04, debug)	2h 27m 30s
pyflakes	2m 59s
linux (ubuntu-20.04, codecov)	1h 50m 43s
Build image	0s
Build SLES image	0s
format	6m 25s
sles	4m 55s
cppcheck	58m 41s
tidy	7m 20s
	10h 1m 16s

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