Make Int -> Bool conversions explicit

rocket/src/main/scala/ecc.scala

@@ -57,7 +57,7 @@ class SECCode extends Code
 
     val y = for (i <- 1 to n) yield {
       if (isPow2(i)) {
-        val r = for (j <- 1 to n; if j != i && (j & i))
+        val r = for (j <- 1 to n; if j != i && (j & i).toBoolean)
           yield x(mapping(j))
         r reduce (_^_)
       } else
@@ -71,7 +71,7 @@ class SECCode extends Code
 
     val p2 = for (i <- 0 until log2Up(n)) yield 1 << i
     val syndrome = p2 map { i =>
-      val r = for (j <- 1 to n; if j & i)
+      val r = for (j <- 1 to n; if (j & i).toBoolean)
         yield y(j-1)
       r reduce (_^_)
     }

rocket/src/main/scala/util.scala

@@ -3,15 +3,18 @@ package rocket
 import Chisel._
 import scala.math._
 
-object Util
+class BooleanToInt(x: Int) {
-{
+  def toBoolean: Boolean = if (x != 0) true else false
+}
+
+object Util {
   implicit def intToUInt(x: Int): UInt = UInt(x)
-  implicit def intToBoolean(x: Int): Boolean = if (x != 0) true else false
-  implicit def booleanToInt(x: Boolean): Int = if (x) 1 else 0
   implicit def booleanToBool(x: Boolean): Bits = Bool(x)
   implicit def intSeqToUIntSeq(x: Iterable[Int]): Iterable[UInt] = x.map(UInt(_))
-
   implicit def wcToUInt(c: WideCounter): UInt = c.value
+
+  implicit def booleanToInt(x: Boolean): Int = if (x) 1 else 0
+  implicit def intToBooleanToInt(x: Int): BooleanToInt = new BooleanToInt(x)
 }
 
 object AVec