testsuite: Fix false Fortran regressions with recent gcc

testsuite: Fix false Fortran regressions with recent gcc

gcc-4.9.2-6.fc21.x86_64 -> gcc-5.3.1-2.fc23.x86_64

-PASS: gdb.fortran/vla-ptype.exp: ptype pvla not initialized
+FAIL: gdb.fortran/vla-ptype.exp: ptype pvla not initialized
-PASS: gdb.fortran/vla-history.exp: print vla1 allocated
+FAIL: gdb.fortran/vla-history.exp: print vla1 allocated
-PASS: gdb.fortran/vla-history.exp: print $2
+FAIL: gdb.fortran/vla-history.exp: print $2
-PASS: gdb.fortran/vla-value.exp: print undefined pvla
+FAIL: gdb.fortran/vla-value.exp: print undefined pvla
-PASS: gdb.fortran/vla-value.exp: print non-associated &pvla
+FAIL: gdb.fortran/vla-value.exp: print non-associated &pvla
-PASS: gdb.fortran/vla-value.exp: print undefined pvla(1,3,8)
+FAIL: gdb.fortran/vla-value.exp: print undefined pvla(1,3,8)

These issues get fixed (or removed if no longer applicable) by attached patch.

It is based on Googled:
	http://www.cs.rpi.edu/~szymansk/OOF90/bugs.html#5
	When a pointer is declared its status is undefined, and cannot be
	safely queried with the associated intrinsic.
	-> nullify(VARNAME)
+
	https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/268786
	ALLOCATE is not supposed to initialize the array.
	-> Remove checks like an initial print is: \\( *0, *0, *0...\\)

These regressions remain:
	-PASS: gdb.fortran/library-module.exp: print var_i in lib
	+FAIL: gdb.fortran/library-module.exp: print var_i in lib
	-PASS: gdb.fortran/library-module.exp: print var_i in main
	+FAIL: gdb.fortran/library-module.exp: print var_i in main
I believe it is more a GDB bug (in a code contributed by me), filed:
	gdb.fortran/library-module.exp false regression on GCC upgrade
	https://sourceware.org/bugzilla/show_bug.cgi?id=19635

gdb/testsuite/ChangeLog
2016-02-14  Jan Kratochvil  <jan.kratochvil@redhat.com>

	Fix compatibility with recent gfortran-5.3.1.
	* gdb.fortran/vla-history.exp (print vla1 allocated)
	(print vla2 allocated, print $2, print $3): Remove
	(print $4): Rename to ...
	(print $2): ... here.
	(print $9): Rename to ...
	(print $5): ... here.
	(print $10): Rename to ...
	(print $6): ... here.
	* gdb.fortran/vla.f90: Add pvla initialization.