[fortran,patch] Fix PR 36186, wrong handling of BOZ in CMPLX

[FX]

Attached patch fixes handling of BOZ in CMPLX, DCMPLX and COMPLEX:  
when they're not simplified (for example because only *one* arg is a  
constant or BOZ), the one argument that's a BOZ is then never  
converted. This now takes place in the simplification routine, before  
bailing out, because it's the simplest place to do so. Due to that,  
we also accepted invalid too-large BOZ.

Bootstrapped and regtested on x86_64-linux, coming with two  
testcases. OK to commit?

FX


-- 
François-Xavier Coudert
http://www.homepages.ucl.ac.uk/~uccafco/

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