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codegen: ensure i1 bool is widened to i8 before storing (#52189)
Teach value_to_pointer to convert primitive types to their stored representation first, to avoid exposing undef bits later (via memcpy). Take this opportunity to also generalizes the support for zext Bool to anywhere inside any struct for changing any bitwidth to a multiple of 8 bytes. This would change a vector like <2 x i4> from occupying i8 to i16 (c.f. LLVM's LangRef), if such an operation were expressible in Julia today. And take this opportunity to do a bit of code cleanup, now that codegen is better and using helpers from LLVM. Fixes #52127 (cherry picked from commit 9aa7980)
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