[Issue 23102] pinholeopt, "Conditional jump or move depends on uninitialised value(s)"

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23102

duser at neet.fi changed:

           What    |Removed                     |Added
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                 CC|                            |duser at neet.fi

--- Comment #6 from duser at neet.fi ---
Created attachment 1852
  --> https://issues.dlang.org/attachment.cgi?id=1852&action=edit
fix

minimal reproducer

uint fn(uint a)
{
        return 1 / a;
}

compile: valgrind dmd -O -c test.d

with "--track-origins=yes", valgrind also prints what function the
uninitialized data comes from

==17569==  Uninitialised value was created by a stack allocation
==17569==    at 0x70AADF: cddiv(CodeBuilder&, elem*, unsigned int*)
(cod2.d:1298)

there was a void-initialized struct there, the patch fixes this by initializing
the field that was checked at "cod3.d:5761" in the backtrace

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