Implemented constant folding

src/build/config/config.go

@@ -15,6 +15,15 @@ const (
 )
 
 var (
+	// Shows the assembly instructions at the end of the compilation.
 	Assembler = false
-	Dry       = false
+
+	// Calculates the result of operations on constants at compile time.
+	ConstantFold = true
+
+	// Skips writing the executable to disk.
+	Dry = false
+
+	// Skips compiling assert statements.
+	SkipAsserts = false
 )