Strip Interface class of most of its logic, make it all about Module exports

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index a3ae4abd00bbc1f33dde5aaa8d2efb38aa6dc2e4..38d5ab27261186ae2f87bc41fd925317fe116bdb 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -712,12 +712,10 @@ enum VariableMode {
 
   CONST_LEGACY,    // declared via legacy 'const' declarations
 
-  LET,             // declared via 'let' declarations (first lexical)
+  LET,             // declared via 'let' declarations
 
   CONST,           // declared via 'const' declarations
 
-  MODULE,          // declared via 'module' declaration (last lexical)
-
   // Variables introduced by the compiler:
   INTERNAL,        // like VAR, but not user-visible (may or may not
                    // be in a context)
@@ -745,17 +743,17 @@ inline bool IsDynamicVariableMode(VariableMode mode) {
 
 
 inline bool IsDeclaredVariableMode(VariableMode mode) {
-  return mode >= VAR && mode <= MODULE;
+  return mode >= VAR && mode <= CONST;
 }
 
 
 inline bool IsLexicalVariableMode(VariableMode mode) {
-  return mode >= LET && mode <= MODULE;
+  return mode == LET || mode == CONST;
 }
 
 
 inline bool IsImmutableVariableMode(VariableMode mode) {
-  return (mode >= CONST && mode <= MODULE) || mode == CONST_LEGACY;
+  return mode == CONST || mode == CONST_LEGACY;
 }