bug#41615: [feature/native-comp] Dump prettier C code.

[Nicolas Bértolo]

I rewrote the "cast with functions" patch and added a few more patches.
- Implement cast to bool as !!x instead of (x & 0xFF).
- Throw an ICE when asked to perform sign extension. I didn't see any
  issues with this one. So for now it is not necessary to implement them.

Nico.

0003-Implement-casts-to-bool-using-double-negation-like-i.patch
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0004-Throw-an-ICE-when-asked-to-emit-a-cast-with-sign-ext.patch
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0001-Remove-unnecessary-DLL-load-of-gcc_jit_block_add_ass.patch
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0002-Define-casts-using-functions.patch
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