feat: add branch info io def

Author: maksyuki

rtl/tc_l2/src/main/scala/port/BRANCH.scala

@@ -0,0 +1,15 @@
+package treecorel2
+
+import chisel3._
+import chisel3.util._
+
+import treecorel2.common.ConstVal
+
+class BRANCHIO extends Bundle {
+  val branch = Output(Bool()) // prev inst is a b/j
+  val jump   = Output(Bool()) // is 'jal' or 'jalr'
+  val taken  = Output(Bool()) // is prev branch taken
+  val idx    = Output(UInt(ConstVal.GHRLen.W)) // prev idx of PHT
+  val pc     = Output(UInt(ConstVal.AddrLen.W)) // prev instruction PC
+  val tgt    = Output(UInt(ConstVal.AddrLen.W)) // prev branch tgt
+}