Chez Scheme: fix some typos

racket/src/ChezScheme/s/cmacros.ss

@@ -854,7 +854,7 @@
 (define-constant type-exactnum         #b01010110)
 (define-constant type-box               #b0001110) ; bit 3 set for non-numbers
 (define-constant type-immutable-box    #b10001110) ; low 7 bits match `type-box`
-(define-constant type-stencil-vector     #b011110) ; remianing bits for stencil; type looks like immediate
+(define-constant type-stencil-vector     #b011110) ; remaining bits for mask; type looks like immediate
 ; #b00101110 (forward_marker) must not be used
 (define-constant type-code             #b00111110)
 (define-constant type-port             #b11001110)

racket/src/ChezScheme/s/mkgc.ss

@@ -393,7 +393,7 @@
       (count countof-vector)]
 
      [stencil-vector
-      ;; Assumes stencil-vector masks look like fixnums;
+      ;; Assumes stencil-vector tags look like immediates or fixnums;
       ;; if not, stencil vectors will need their own space
       (space
        (cond

racket/src/ChezScheme/s/mkheader.ss

@@ -339,9 +339,9 @@
   
         (def "Sstencil_vector_length(x)"
           (format "Spopcount(((uptr)~a)>>~d)"
-            (access "x" vector type)
+            (access "x" stencil-vector type)
             ($ stencil-vector-mask-offset)))
-        (defref Sstencil_vector_ref vector data)
+        (defref Sstencil_vector_ref stencil-vector data)
         
         (export "iptr" "Sinteger_value" "(ptr)")
         (def "Sunsigned_value(x)" "(uptr)Sinteger_value(x)")