Already during parsing, the allocatable character array assignment
    x = (x)

is converted to two gfc_codes with EXEC_ASSIGN, namely:

   ASSIGN z1:_F.DA0(FULL) (parens z1:x(FULL))
   ASSIGN z1:x(FULL) z1:_F.DA0(FULL)

But the current code expects only one gfc_code - as parse.c does some
checks, that's unexpected for resolution and currently is checked with
an gcc_assert.

Solution: I now defer the gfc_assert until after diagnosing the arguments.

OK for mainline (only affected version)?

Tobias
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