Andrew Kelley 30a824cb9e astgen: eliminate rlWrapPtr and all its callsites
The following AST avoids unnecessary derefs now:
 * error set decl
 * field access
 * array access
 * for loops: replace ensure_indexable and deref on the len_ptr with a
   special purpose ZIR instruction called indexable_ptr_len.

Added an error note when for loop operand is the wrong type.

I also accidentally implemented `@field`.
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