Implemented compilation finished events

src/build/compiler.go

@@ -11,12 +11,15 @@ import (
 
 // compiler is the data structure we embed in each function to preserve compilation state.
 type compiler struct {
-	assembler asm.Assembler
-	count     counter
-	cpu       cpu.CPU
-	debug     []debug
-	err       error
-	variables map[string]*Variable
+	assembler   asm.Assembler
+	count       counter
+	cpu         cpu.CPU
+	debug       []debug
+	err         error
+	variables   map[string]*Variable
+	functions   map[string]*Function
+	sideEffects int
+	finished    chan struct{}
 }
 
 // counter stores how often a certain statement appeared so we can generate a unique label from it.