Re: regression on zOS between 5.4.8 to 5.5.0 on zOS

> 2. Older Nvidia C/C++ compilers (e.g., nvc 22.11-0) struggled with
> overlapping assignments in lcode.c (even with [4] applied).

There is another "overlapping assignment" in lcode.c. In function
'luaK_indexed', there is this assignment:

  t->u.ind.t = cast_byte(t->u.var.ridx);

Although the field u.ind.t does not overlap with u.var.ridx, the field
u.ind (the enclosing structure) overlaps with u.var. Technically that
should be correct, but maybe it causes problems for a buggy compiler.
(Just in case, commit 8164d093 added an intermediate variable into that
assignment.)

Maybe there are other undetected overlapping assignments in lcode.c;
it uses a lot the structure 'expdesc', and it does several assignments
among the fields of that structure.

-- Roberto

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