These optimizations create smaller and a bit faster code on my machine. I've...

These optimizations create smaller and a bit faster code on my machine. I've also disabled an optimization that may be dangerous. Intrinsic functions conflict with errno.

PCbuild9/pginstrument.vsprops

@@ -8,10 +8,10 @@
 	>
 	<Tool
 		Name="VCCLCompilerTool"
-		Optimization="3"
-		InlineFunctionExpansion="2"
-		EnableIntrinsicFunctions="true"
-		FavorSizeOrSpeed="1"
+		Optimization="2"
+		InlineFunctionExpansion="1"
+		EnableIntrinsicFunctions="false"
+		FavorSizeOrSpeed="2"
 		OmitFramePointers="true"
 		EnableFiberSafeOptimizations="false"
 		WholeProgramOptimization="true"