Add ppc476 workaround bootstrap test

I was running this by hand to test out --ppc476-workaround.  Another
bootstrap test doesn't take all that long, so let's add it to the
testsuite.

	* ld-bootstrap/bootstrap.exp: Add ppc476 workaround test.
	* ld-bootstrap/ppc476.t: New file.

ld/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2014-02-21  Alan Modra  <amodra@gmail.com>
+
+	* ld-bootstrap/bootstrap.exp: Add ppc476 workaround test.
+	* ld-bootstrap/ppc476.t: New file.
+
 2014-02-19  Igor Zamyatin  <igor.zamyatin@intel.com>
 	    H.J. Lu  <hongjiu.lu@intel.com>
 

ld/testsuite/ld-bootstrap/bootstrap.exp

@@ -49,9 +49,13 @@ if [check_plugin_api_available] {
 # order to test -r.  Then link the result into an executable, ld1, to
 # really test -r.  Use ld1 to link a fresh ld, ld2.  Use ld2 to link a
 # new ld, ld3.  ld2 and ld3 should be identical.
+set test_flags {"" "strip" "--static" "--traditional-format"
+		"--no-keep-memory" "--relax"}
+if { [istarget "powerpc-*-*"] } {
+    lappend test_flags "--ppc476-workaround"
+}
 
-foreach flags {"" "strip" "--static" "--traditional-format"
-	       "--no-keep-memory" "--relax"} {
+foreach flags $test_flags {
     set do_strip "no"
     if {"$flags" == "strip"} { 
 	set testname "bootstrap with $flags"
@@ -69,6 +73,10 @@ foreach flags {"" "strip" "--static" "--traditional-format"
 	set partial_flags ""
     }
 
+    if { $partial_flags == "--ppc476-workaround" } {
+	append partial_flags " -T $srcdir/$subdir/ppc476.t"
+    }
+
     # This test can only be run if we have the ld build directory,
     # since we need the object files.
     if {$ld != "$objdir/ld-new"} {