[patch, fortran] Fix off-by-one array size in trans-intrinsic.c

[FX]

Many thanks to Juha for the bug report, and sorry for not replying earlier.  Once I had valgrind installed on my machine, it became clear your issue was reproducible. In fact, I simply made an array that's too small... The attached patch fixes it.

It also removes an unused assignment to real16_decl for complex intrinsics (it was used in a preliminary version of my initial patch, but is not needed anymore).

Bootstrapped and regtested both with TFmode enabled and without, on x86_64-linux. Tested a few testcases under valgrind. OK to commit?

FX


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