Fix more MSVC warnings, courgette/ edition.

courgette/assembly_program.h

Index: courgette/assembly_program.h
diff --git a/courgette/assembly_program.h b/courgette/assembly_program.h
index 701b4767a8cffe0b6356ec4cc4a87eded480b7f6..4c1cba2c4ee27d9b9df42dda2e1ad661e06f056a 100644
--- a/courgette/assembly_program.h
+++ b/courgette/assembly_program.h
@@ -87,7 +87,7 @@ class AssemblyProgram {
   CheckBool EmitByteInstruction(uint8 byte) WARN_UNUSED_RESULT;
 
   // Generates multiple bytes of data or machine instructions.
-  CheckBool EmitBytesInstruction(const uint8* value, uint32 len)
+  CheckBool EmitBytesInstruction(const uint8* value, size_t len)
       WARN_UNUSED_RESULT;
 
   // Generates 4-byte relative reference to address of 'label'.
@@ -129,9 +129,6 @@ class AssemblyProgram {
   // Trim underused labels
   CheckBool TrimLabels();
 
-  void PrintLabelCounts(RVAToLabel* labels);
-  void CountRel32ARM();
-
  private:
   ExecutableType kind_;