[Courgette] Reduce AssemblyProgram to reduce Courgette-apply RAM floor and disk churn.

courgette/encoded_program.h

Index: courgette/encoded_program.h
diff --git a/courgette/encoded_program.h b/courgette/encoded_program.h
index 1169331b1d8d6a94ce47b7c488f60004a893059b..390514606191399bc1a364911560029461abb98b 100644
--- a/courgette/encoded_program.h
+++ b/courgette/encoded_program.h
@@ -14,6 +14,7 @@
 #include "base/macros.h"
 #include "courgette/courgette.h"
 #include "courgette/image_utils.h"
+#include "courgette/instruction_utils.h"
 #include "courgette/memory_allocator.h"
 #include "courgette/types_elf.h"
 
@@ -80,6 +81,10 @@ class EncodedProgram {
   // (5) Assembles the 'binary assembly language' into final file.
   CheckBool AssembleTo(SinkStream* buffer) WARN_UNUSED_RESULT;
 
+  // Calls |gen| to extract all instructions, which are then encoded and stored.
+  CheckBool GenerateInstructions(ExecutableType exe_type,
+                                 const InstructionGenerator& gen);
+
  private:
   // Binary assembly language operations.
   // These are part of the patch format. Reusing an existing value will