Currently, our constant instruction handling is inconsistent. Our opcode promotion strategy is wrong for dynamic constants: compile and run the Sick.java with 24 preview and run the Test.class, JVM will fail to verify Test.class due to it using ldc_w for a dynamic constant returning double.

I recommend to only carry out the opcode promotion if:

1. The opcode is ldc (not ldc_w or ldc2_w)
2. The entry is external, and index is too wide after adaptation.

In addition, we allow creation of LoadConstantInstruction with ldc2_w referring to non-category-2 and vice versa. Should we restrict this at all?