Deduplicate functions in compacted JIT code

to improve code locality.

Using benchmark-driver/sinatra with 100 methods JIT-ed,

[Before] 12149.97 rps
1.3M    /tmp/_ruby_mjit_p31171u145.so

[After] 12818.83 rps
260K    /tmp/_ruby_mjit_p32155u145.so

(VM is 13714.89 rps)

1 files changed, 2 insertions, 2 deletions

diff --git a/mjit.c b/mjit.c
index 59e58f3f70..2c2af0a2a6 100644
--- a/mjit.c
+++ b/mjit.c
@@ -191,7 +191,7 @@ free_list(struct rb_mjit_unit_list *list, bool close_handle_p)
             if (unit->handle && dlclose(unit->handle)) {
                 mjit_warning("failed to close handle for u%d: %s", unit->id, dlerror());
             }
-            clean_object_files(unit);
+            clean_temp_files(unit);
             free(unit);
         }
         else {
@@ -889,7 +889,7 @@ skip_cleaning_object_files(struct rb_mjit_unit_list *list)
     // No mutex for list, assuming MJIT worker does not exist yet since it's immediately after fork.
     list_for_each_safe(&list->head, unit, next, unode) {
 #ifndef _MSC_VER // Actually mswin does not reach here since it doesn't have fork
-        if (unit->o_file) unit->o_file_inherited_p = true;
+        if (unit->c_file) unit->c_file_inherited_p = true;
 #endif
 
 #if defined(_WIN32) // mswin doesn't reach here either. This is for MinGW.