[hl] Rework Null<Int/Float/Bool> comparison for spec/alloc

[yuxiaomao]

• When OpGt | OpGte | OpLt | OpLte Null<Int/Float>, first test with null (if null return false), then safecast and compare the value. For Some operator tests related to Null<T> #8426
• When OpEq | OpNotEq Null<Int/Float/Bool> with Int/Float/bool, first test with null (if null return false), then safecast and compare, reduce the use of todyn (memory allocation). For Hashlink null comparison #11416
• Remove recursion of common_type with the use of common_type_number, so that the recursion is more clear
• Use the same comparison logic during jump and normal comparison: let eval_expr use jump_expr in case of comparison

[yuxiaomao]

Oh Flash ! I'll remove the test file after CI run. Just to ensure that it works on HL.

[Simn]

Maybe merge this with #8426 so we have the changes and tests in one place?

[yuxiaomao]

I would like to, but as you can see in the CI of previous commit, the flash test fail. Should I make an exception for flash target?

[Simn]

Yes we're not going to fix it for Flash.