Drop view when consuming line info

Fix locviews on ia64.  If we do not drop the view after copying line
info to slots in the bundle, we may attempt to compute the view more
than once and get very confused.

for  gas/ChangeLog

	* dwarf2dbg.c (dwarf2_consume_line_info): Drop view.

gas/ChangeLog

@@ -1,3 +1,7 @@
+2018-06-01  Alexandre Oliva <aoliva@redhat.com>
+
+	* dwarf2dbg.c (dwarf2_consume_line_info): Drop view.
+
 2018-06-01  Jan Beulich  <jbeulich@suse.com>
 
 	* testsuite/gas/i386/ilp32/x86-64-opcode.d,

gas/dwarf2dbg.c

@@ -624,6 +624,7 @@ dwarf2_consume_line_info (void)
 		     | DWARF2_FLAG_PROLOGUE_END
 		     | DWARF2_FLAG_EPILOGUE_BEGIN);
   current.discriminator = 0;
+  current.view = NULL;
 }
 
 /* Called for each (preferably code) label.  If dwarf2_loc_mark_labels