testsuite: Adjust pruning

Here is the patch to adjust the include-stack pruning messages to also
strip out c++ modules.  The ICE regexp was a little too strict such
that if someone overrides the bug-reporting URL it doesn't trigger.
May as well relax it too.

	gcc/testsuite/
	* lib/prune.exp (prune_gcc_output): Adjust include stack pruning
	for modules.
	(print_ices): Relax regexp.

gcc/testsuite/lib/prune.exp

@@ -48,7 +48,11 @@ proc prune_gcc_output { text } {
     regsub -all "(^|\n)\[^\n\]*: re(compiling|linking)\[^\n\]*" $text "" text
     regsub -all "(^|\n)Please submit.*instructions\[^\n\]*" $text "" text
     regsub -all "(^|\n)\[0-9\]\[0-9\]* errors\." $text "" text
-    regsub -all "(^|\n)(In file included|\[ \]+from)\[^\n\]*" $text "" text
+
+    # Diagnostic inclusion stack
+    regsub -all "(^|\n)(In file)?\[ \]+included from \[^\n\]*" $text "" text
+    regsub -all "(^|\n)\[ \]+from \[^\n\]*" $text "" text
+    regsub -all "(^|\n)(In|of) module( \[^\n \]*,)? imported at \[^\n\]*" $text "" text
 
     # Ignore informational notes.
     regsub -all "(^|\n)\[^\n\]*: note: \[^\n\]*" $text "" text
@@ -128,8 +132,8 @@ proc prune_file_path { text } {
 # footnote.
 
 proc prune_ices { text } {
-  regsub -all "(^|\n)\[^\n\]*: internal compiler error:.*for instructions\[^\n\]*" $text "" text
-  regsub -all "(^|\n|')*Internal compiler error:.*for instructions\[^\n\]*" $text "" text
+  regsub -all "(^|\n)\[^\n\]*: internal compiler error:.*\nSee \[^\n\]*" $text "" text
+  regsub -all "(^|\n|')*Internal compiler error:.*\nSee \[^\n\]*" $text "" text
   return $text
 }