[Patch, Fortran] PR fortran/31822: Runtime string length check for pointer assignment

[Daniel Kraft]

Hi,

building upon my recent patch for PR 38137 (runtime string length 
checking for arguments to MERGE), this implements string length checks 
for pointer assignment enabled by -fbounds-check.  Additionally, I 
changed the code doing the compile time checks to use 
gfc_check_same_strlen instead of doing it inline, which also means it 
gives a more detailed error message now (including the unequal string 
lengths).

Regression testing on GNU/Linux-x86-32 at the moment, but I don't expect 
any (did a test on a nearly identical patch version before).

Is this ok for trunk/4.4?  Or should we wait for 4.5 with it, as it got 
a somewhat lengthier patch than the one before?

Thanks,
Daniel

-- 
Done:  Arc-Bar-Cav-Rog-Sam-Tou-Val-Wiz
To go: Hea-Kni-Mon-Pri-Ran
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