Use ChiselStage in Tests

This migrates the tests to Chisel 3.4/FIRRTL 1.4. This primarily
involves removing usages of deprecated methods including:

- Remove usages of Driver
- Use ChiselStage methods instead of BackendCompilationUtilities
  methods
- Use Dependency API for custom transforms
- Use extractCause to unpack StackError

Signed-off-by: Schuyler Eldridge <schuyler.eldridge@ibm.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/test/scala/chiselTests/Stack.scala b/src/test/scala/chiselTests/Stack.scala
index 3c13273a..36f82960 100644
--- a/src/test/scala/chiselTests/Stack.scala
+++ b/src/test/scala/chiselTests/Stack.scala
@@ -3,6 +3,7 @@
 package chiselTests
 
 import chisel3._
+import chisel3.stage.ChiselStage
 import chisel3.util._
 
 class ChiselStack(val depth: Int) extends Module {
@@ -69,7 +70,7 @@ class StackTester(c: Stack) extends Tester(c) {
 class StackSpec extends ChiselPropSpec {
 
   property("Stack should elaborate") {
-    elaborate { new ChiselStack(2) }
+    ChiselStage.elaborate { new ChiselStack(2) }
   }
 
   ignore("StackTester should return the correct result") { }