[C++ Patch] Add location_t parameter to grokvardecl

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

the other day I noticed that we weren't getting right the first location 
of pr53037-4.C, for a variable, whereas the next one, for a function, 
was Ok. Indeed, we were passing a location only to grokfndecl. In other 
terms, I found a good empirical reason to move the declaration of the 
local loc = declarator ? declarator->id_loc : input_location further up 
;) Tested x86_64-linux.

Thanks, Paolo.

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