YJIT: Fix unused warnings

```
warning: unused import: `condition::Condition`
  --> src/asm/arm64/arg/mod.rs:13:9
   |
13 | pub use condition::Condition;
   |         ^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_imports)]` on by default

warning: unused import: `rb_yjit_fix_mul_fix as rb_fix_mul_fix`
   --> src/cruby.rs:188:9
    |
188 | pub use rb_yjit_fix_mul_fix as rb_fix_mul_fix;
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

warning: unused import: `rb_insn_len as raw_insn_len`
   --> src/cruby.rs:142:9
    |
142 | pub use rb_insn_len as raw_insn_len;
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[warn(unused_imports)]` on by default
```

Make asm public so it stops warning about unused public stuff in there.

1 files changed, 0 insertions, 6 deletions

diff --git a/yjit.c b/yjit.c
index 58ea3083e2..d5071cb952 100644
--- a/yjit.c
+++ b/yjit.c
@@ -871,12 +871,6 @@ rb_yjit_fix_mod_fix(VALUE recv, VALUE obj)
     return rb_fix_mod_fix(recv, obj);
 }
 
-VALUE
-rb_yjit_fix_mul_fix(VALUE recv, VALUE obj)
-{
-    return rb_fix_mul_fix(recv, obj);
-}
-
 // Print the Ruby source location of some ISEQ for debugging purposes
 void
 rb_yjit_dump_iseq_loc(const rb_iseq_t *iseq, uint32_t insn_idx)