re PR tree-optimization/91074 (c-c++-common/gomp/scan-3.c fails with ICE starting with r272958)

	PR tree-optimization/91074
	* omp-low.c (lower_omp_for_scan): Set DECL_GIMPLE_REG_P on cplx
	temporary.

From-SVN: r273037

gcc/ChangeLog

 2019-07-04  Jakub Jelinek  <jakub@redhat.com>
 
+	PR tree-optimization/91074
+	* omp-low.c (lower_omp_for_scan): Set DECL_GIMPLE_REG_P on cplx
+	temporary.
+
 	PR rtl-optimization/90756
 	* explow.c (promote_ssa_mode): Always use TYPE_MODE, don't bypass it
 	for VECTOR_TYPE_P.

gcc/omp-low.c

@@ -9699,6 +9699,7 @@ lower_omp_for_scan (gimple_seq *body_p, gimple_seq *dlist, gomp_for *stmt,
   gimple_seq_add_stmt (body_p, g);
 
   tree cplx = create_tmp_var (build_complex_type (unsigned_type_node, false));
+  DECL_GIMPLE_REG_P (cplx) = 1;
   g = gimple_build_call_internal (IFN_MUL_OVERFLOW, 2, thread_nump1, twok);
   gimple_call_set_lhs (g, cplx);
   gimple_seq_add_stmt (body_p, g);