Added configurations and files for profile guided optimization (PGO).
diff --git a/PCbuild9/pgupdate.vsprops b/PCbuild9/pgupdate.vsprops
new file mode 100644
index 0000000..826242d
--- /dev/null
+++ b/PCbuild9/pgupdate.vsprops
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="Windows-1252"?>
+<VisualStudioPropertySheet
+	ProjectType="Visual C++"
+	Version="8.00"
+	Name="pgoptimize"
+	InheritedPropertySheets="$(SolutionDir)\pginstrument.vsprops"
+	>
+	<Tool
+		Name="VCLinkerTool"
+		LinkTimeCodeGeneration="4"
+	/>
+</VisualStudioPropertySheet>