gccrs: Make the coerce borrowed pointer consistent with try flag

This interface is not respecting the coercion api commit is always false,
we need to ensure this is respected via the try flag like the rest of the
coercion logic.

gcc/rust/ChangeLog:

	* typecheck/rust-coercion.cc (TypeCoercionRules::select): respect try flag

Signed-off-by: Philip Herron <[email protected]>

Author: philberty

gcc/rust/typecheck/rust-coercion.cc

@@ -439,7 +439,8 @@ TypeCoercionRules::select (TyTy::BaseType &autoderefed)
     = unify_site_and (autoderefed.get_ref (), TyTy::TyWithLocation (expected),
 		      TyTy::TyWithLocation (&autoderefed),
 		      UNDEF_LOCATION /* locus */, false /*emit_errors*/,
-		      false /*commit_if_ok*/, true /*infer*/, true /*cleanup*/);
+		      !try_flag /*commit_if_ok*/, try_flag /*infer*/,
+		      try_flag /*cleanup*/);
   bool ok = result->get_kind () != TyTy::TypeKind::ERROR;
   if (!ok)
     return false;