Support for creating chisel annotations that are consumed by firrtl (#393)

* Support for creating chisel annotations that are consumed by firrtl
Update annotation serialization in Driver
Add DiamondAnnotation Spec that illustrates how to do simple annotations
frontEnd must have dependency on firrtl
Add annotation method to Module
Circuit has extra optional parameter that is Seq of Annotations
In Builder add annotation buffer to DynamicContext to store annotations created in modules
Added explicit types on naming api methods to avoid type confusion
Because some names are not available until elaboration create intermediate ChiselAnnotation that
gets turned into a firrtl Annotation after elaboration
In execute pass firrtl text and annotation to firrtl are now passed in through optionManager, though
intermediate file .fir and .anno files are still created for inspection and/or later use

* Somehow missed ChiselAnnotation

* fixes for Jack's review of PR

1 files changed, 5 insertions, 1 deletions

diff --git a/chiselFrontend/src/main/scala/chisel3/core/Module.scala b/chiselFrontend/src/main/scala/chisel3/core/Module.scala
index bd406529..76a3b240 100644
--- a/chiselFrontend/src/main/scala/chisel3/core/Module.scala
+++ b/chiselFrontend/src/main/scala/chisel3/core/Module.scala
@@ -14,7 +14,7 @@ object Module {
   /** A wrapper method that all Module instantiations must be wrapped in
     * (necessary to help Chisel track internal state).
     *
-    * @param m the Module being created
+    * @param bc the Module being created
     *
     * @return the input module `m` with Chisel metadata properly set
     */
@@ -85,6 +85,10 @@ extends HasId {
     iodef
   }
 
+  def annotate(annotation: ChiselAnnotation): Unit = {
+    Builder.annotations += annotation
+  }
+
   private[core] var ioDefined: Boolean = false
 
   /**