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If a function is stashed for inlining and inlined in all of its
callsites or unused, it never ends up in the object file. If any symbol
reference to it is emitted, then it must be de-inlined (rematerialized),
and this is done near the end before emitting the actual object file.
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It was meant as a micro-optimization but actually keeping it in sync was
annoying. This for example was broken:
```
extern enum foo { ... } g_foo;
enum foo g_foo;
```
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Is much nicer. I don't know whether I want to do it for the other int
types too. char and uchar are fine as bytes. u/short -> u/s16int, maybe.
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The motivation is for aarch64 msub/madd instrs, for isel to produce. But
it should be useful for other things too.
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And add some GCC predefs like __SIZE_TYPE__, __LONG_SIZE__, etc
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`const int x[]` was being treated as `const int x[const]`, which is
wrong, and matters when `x` is a function parameter that really decays
to a pointer (`int const *const x`)
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OpenBSD enforces read xor execute (XOM) even in x86-64. Not aware of any
other platforms that do this.
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The intent is for _Alignas declarations but those aren't implemented
yet. And initializing that field in declarator() can mess with .sym.
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Looks nicer
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