eval is actually compile

* module/ice-9/boot-9.scm (eval): Here at the tail of boot-9, replace
  the root definition of `eval' with a procedure that will call
  `compile'.

* test-suite/tests/syntax.test ("top-level define"):
  ("internal define"): Run unmemoization tests in the interpreter, using
  primitive-eval.

module/ice-9/boot-9.scm

@@ -3492,6 +3492,14 @@ module '(ice-9 q) '(make-q q-length))}."
 
 
 
+;;; Replace the C evaluator with the compiler.
+;;;
+
+(define (eval x env)
+  ((@ (system base compile) compile) x #:from 'scheme #:to 'value #:env env))
+
+
+
 ;;; Place the user in the guile-user module.
 ;;;