stage2: lower each struct field type, align, init separately #12096
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Previously, struct types, alignment values, and initialization expressions were all lowered into the same ZIR body, which caused false positive "depends on itself" errors when the initialization expression depended on the size of the struct. This also uses ResultLoc.coerced_ty for struct field alignment and initialization values. The resulting ZIR encoding ends up being roughly the same, neither smaller nor larger than previously. Closes #12029
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Previously, struct types, alignment values, and initialization
expressions were all lowered into the same ZIR body, which caused false
positive "depends on itself" errors when the initialization expression
depended on the size of the struct.
This also uses ResultLoc.coerced_ty for struct field alignment and
initialization values. The resulting ZIR encoding ends up being roughly
the same, neither smaller nor larger than previously.
Closes #12029
cc @kristoff-it - this affects ZIR encoding for autodocs