Cleanup of krnl iterate loops

[AlexandreEichenberger]

The code used a mixture of constant and non-constant DialectBuilder, and that caused some strange code pattern. Now all of the lambda functions used in the Dialect Builders used constant Dialect Builder parameters.

This PR also change trivial

loops = krnl.defineLoops(1);
krnl.iterateIE(loops, loops, {lb}, {ub}, ...);

into the new pattern

krnl.forLoopIE(lb, ub, 1, /*parallel*/ false, ...);

Sometimes, blocking>1 and parallel can be true, depending on what the code was.

None of the changes here are functional.

[tungld]

LGTM!

[jenkins-droid]

Jenkins Linux amd64 Build #15699 [push] Cleanup of krnl iterate ... started at 07:41

[jenkins-droid]

Jenkins Linux ppc64le Build #14729 [push] Cleanup of krnl iterate ... started at 08:53

[jenkins-droid]

Jenkins Linux s390x Build #15702 [push] Cleanup of krnl iterate ... started at 08:41

[jenkins-droid]

Jenkins Linux amd64 Build #15699 [push] Cleanup of krnl iterate ... passed after 1 hr 11 min

[jenkins-droid]

Jenkins Linux s390x Build #15702 [push] Cleanup of krnl iterate ... passed after 1 hr 32 min

[jenkins-droid]

Jenkins Linux ppc64le Build #14729 [push] Cleanup of krnl iterate ... passed after 2 hr 0 min