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Crashes in ASM or VerifyErrors used to occur when assigning
an expression of type Nothing to an element of a primitive array.
This commit adapts the RHS of the assignment to the element
type to correct this. `adapt` contains logic to insert an
`ATHROW` of the slot of type `Nothing$`, which makes everything
line up. The subsequent array stores become dead code and are
dropped later on in code gen, so the test case compiles to:
public void foo0(double[]);
Code:
0: bipush 42
2: istore_2
3: aload_1
4: iconst_0
5: aload_0
6: invokevirtual #30 // Method throwExpected:()Lscala/runtime/Nothing$;
9: athrow
I found a similar bug in the emission of primitive unboxing and
fixed that too.
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