Libgomp magic offset value self-documentation

Libgomp magic offset value self-documentation

2019-10-02  Julian Brown  <julian@codesourcery.com>
	    Cesar Philippidis  <cesar@codesourcery.com>

	libgomp/
	* libgomp.h (OFFSET_INLINED, OFFSET_POINTER, OFFSET_STRUCT): Define.
	* target.c (FIELD_TGT_EMPTY): Define.
	(gomp_map_val): Use OFFSET_* macros instead of magic constants.  Write
	as switch instead of list of ifs.
	(gomp_map_vars_internal): Use OFFSET_* and FIELD_TGT_EMPTY macros.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@276519 138bc75d-0d04-0410-961f-82ee72b054a4