disasm: Add private var "logging".

Author: vibhavp

disasm/disasm.go

@@ -459,8 +459,10 @@ func Disassemble(fn wasm.Function, module *wasm.Module) (*Disassembly, error) {
 		curIndex++
 	}
 
-	for _, instr := range disas.Code {
-		logger.Printf("%v %v", instr.Op.Name, instr.NewStack)
+	if logging {
+		for _, instr := range disas.Code {
+			logger.Printf("%v %v", instr.Op.Name, instr.NewStack)
+		}
 	}
 
 	return disas, nil

disasm/log.go

@@ -10,10 +10,14 @@ import (
 	"os"
 )
 
-var logger *log.Logger
+var (
+	logger  *log.Logger
+	logging bool
+)
 
 func SetDebugMode(l bool) {
 	w := ioutil.Discard
+	logging = l
 
 	if l {
 		w = os.Stderr