Make STAT and ERRMSG work on ALLOCATE, move error handling to library.

This makes STAT and ERRMSG work on ALLOCATE.  It also separates
the allocation of coarrays into two functions: One without error
checking, which is called by compiler-generated code, and one
with error checking for call from user code.

In the course of looking at this, it was also noticed that
allocatable coarrays were not automatically deallocated;
this is now also fixed.  Also, saved allocatable coarrays
are now saved.

gcc/fortran/ChangeLog:

	* trans-array.c (gfc_allocate_shared_coarray): Remove extra
	arguments, just build the call.
	(allocate_shared_coarray_chk): New function.
	(gfc_array_allocate): Adjust where to set the offset.
	Error handling is done in the library for shared coarrays.
	(gfc_trans_deferred_array): No early return for allocatable
	shared coarrays.
	* trans-array.h (gfc_array_allocate): Adjust prototype.
	(gfc_allocate_shared_coarray): Likewise.
	* trans-decl.c: Rename gfor_fndecl_cas_coarray_allocate to
	gfor_fndecl_cas_coarray_alloc for
	brevity.  Add gfor_fndecl_cas_coarray_alloc_chk.
	(gfc_build_builtin_function_decls): Likewise.
	(gfc_trans_shared_coarray): Adjust calling sequence for
	gfc_allocate_shared_coarray.
	(gfc_trans_deferred_vars): Correct handling of saved
	allocatable shared coarrays.
	* trans-stmt.c (gfc_trans_sync): Adjust whitespace.o
	(coarray_alloc_p): Remove.
	(gfc_trans_allocate): Add shared_coarray variable to adjust
	status and errmsg handling.
	* trans.h: Rename gfor_fndecl_cas_coarray_allocate to
	gfor_fndecl_cas_coarray_alloc for brevity.  Add
	gfor_fndecl_cas_coarray_alloc_chk.

libgfortran/ChangeLog:

	* caf_shared/coarraynative.c (test_for_cas_errors): Correct
	handling of stat.
	* caf_shared/libcoarraynative.h (STAT_ERRMSG_ENTRY_CHECK): Use
	unlikely in condition.
	(STAT_ERRMSG_ENTRY_CHECK_RET): Likewise.
	* caf_shared/wrapper.c (cas_coarray_alloc): Adjust arguments.
	Call cas_coarray_alloc_work.
	(cas_coarray_alloc_chk): New function.
	(cas_coarray_alloc_work): New function.

gcc/testsuite/ChangeLog:

	* gfortran.dg/caf-shared/allocate_1.f90: Adjust number of calls to
	sync_all.
	* gfortran.dg/caf-shared/allocate_status_1.f90: New test.
	* gfortran.dg/caf-shared/automatic_deallocate_1.f90: New test.
	* gfortran.dg/caf-shared/save_allocatable_1.f90: New test.

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