This is my patch:

[ 1005891 ] support --with-tsc on PPC

plus a trivial change to settscdump's docstring and a Misc/NEWS entry.
diff --git a/Misc/NEWS b/Misc/NEWS
index f6e2faf..632d446 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -57,6 +57,9 @@
 Build
 -----
 
+- The --with-tsc flag to configure to enable VM profiling with the
+  processor's timestamp counter now works on PPC platforms.
+
 C API
 -----