Regressions on trunk at revision 152762 vs revision 152756

[H.J. Lu ia32]

New failures:
FAIL: g++.dg/plugin/attribute_plugin-test-1.C -fplugin=./attribute_plugin.so  (test for warnings, line 1)
FAIL: g++.dg/plugin/attribute_plugin-test-1.C -fplugin=./attribute_plugin.so (test for excess errors)

New passes: