[Patch, fortran] [54..61/66] inline sum and product: Prevent regressions.

[Mikael Morin]

This is a collection of changes not directly related, but made necessary by
the emergence of regressions in the testsuite without them.
Combined patch not attached, as the separate patches being largely independant,
it is the concatenation of them.

Patch 54    : Enable dependency checking for inline functions. 
Patch 55..56: Fix gfc_conv_elemental_dependencies.
Patch 57..59: Fix {min,max}{loc,val}.
Patch 60    : Fix error markers.
Patch 61    : Disable frontend optimizations.