Issue #24915: Add Clang support to PGO builds and use the test suite
for profile data.

Thanks to Alecsandru Patrascu of Intel for the initial patch.
diff --git a/Misc/ACKS b/Misc/ACKS
index 3704e65..ba144b7 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1079,6 +1079,7 @@
 Harri Pasanen
 Gaël Pasgrimaud
 Ashish Nitin Patil
+Alecsandru Patrascu
 Randy Pausch
 Samuele Pedroni
 Justin Peel