Remove double -> int/uint cast helpers

[saucecontrol]

Probably not worth a R2R break on its own, but with #114410 and #116196 landed, CORINFO_HELP_DBL2INT and CORINFO_HELP_DBL2UINT are no longer used. They can be removed on the next version bump.

[saucecontrol]

Actually, it looks like those are used by the interpreter now. Not sure if they're used by necessity or just because they were there...

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[am11]

There is also

runtime/src/coreclr/jit/targetarm.h

Lines 10 to 12 in c160acf

	// TODO-ARM-CQ: Use shift for division by power of 2
	// TODO-ARM-CQ: Check for sdiv/udiv at runtime and generate it if available
	#define USE_HELPERS_FOR_INT_DIV 1 // BeagleBoard (ARMv7A) doesn't support SDIV/UDIV

which is 1 on arm32 since the initial coreclr commit (2015). Its else branches are pretty much untested rot and our v7 baseline is likely not going to change. (SDIV/UDIV are optional in ARMv7-A and mandatory since ARMv7-M).

Actually, it looks like those are used by the interpreter now. Not sure if they're used by necessity or just because they were there...

cc @kg @BrzVlad

[jkotas]

Feel free to delete these helpers. It is fine to bump R2R version for it. We have done number of bumps this release cycle, so one more is not a problem.

R2R enums like READYTORUN_HELPER_Dbl2Int should stay. We are not deleting those so that we can have one R2R format dumper that works even for older images.

those are used by the interpreter

#116356 is going to clean this up.