Fixing function name

This function is used for marking / pinning vm stack values, so it
should have "vm" in the function name to be more clear.

gc.c

@@ -4417,7 +4417,7 @@ gc_mark_and_pin_stack_values(rb_objspace_t *objspace, long n, const VALUE *value
 }
 
 void
-rb_gc_mark_stack_values(long n, const VALUE *values)
+rb_gc_mark_vm_stack_values(long n, const VALUE *values)
 {
     rb_objspace_t *objspace = &rb_objspace;
     gc_mark_and_pin_stack_values(objspace, n, values);

internal.h

@@ -2357,7 +2357,7 @@ void rb_gc_verify_internal_consistency(void);
 #define RB_OBJ_GC_FLAGS_MAX 6
 size_t rb_obj_gc_flags(VALUE, ID[], size_t);
 void rb_gc_mark_values(long n, const VALUE *values);
-void rb_gc_mark_stack_values(long n, const VALUE *values);
+void rb_gc_mark_vm_stack_values(long n, const VALUE *values);
 
 #if IMEMO_DEBUG
 VALUE rb_imemo_new_debug(enum imemo_type type, VALUE v1, VALUE v2, VALUE v3, VALUE v0, const char *file, int line);

vm.c

@@ -2491,7 +2491,7 @@ rb_execution_context_mark(const rb_execution_context_t *ec)
 	rb_control_frame_t *cfp = ec->cfp;
 	rb_control_frame_t *limit_cfp = (void *)(ec->vm_stack + ec->vm_stack_size);
 
-        rb_gc_mark_stack_values((long)(sp - p), p);
+        rb_gc_mark_vm_stack_values((long)(sp - p), p);
 
 	while (cfp != limit_cfp) {
 	    const VALUE *ep = cfp->ep;