PR fortran/95106 - truncation of long symbol names with EQUIVALENCE

PR fortran/95106 - truncation of long symbol names with EQUIVALENCE

	For long module names, the generated name-mangled symbol was
	truncated, leading to bogus warnings about COMMON block
	mismatches.  Provide sufficiently large temporaries.

gcc/fortran/

2020-05-24  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/95106
	* trans-common.c (gfc_sym_mangled_common_id): Enlarge temporaries
	for name-mangling.

gcc/testsuite/

2020-05-24  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/95106
	* gfortran.dg/equiv_11.f90: New test.