Tune the inline size a bit.

Based on looking at some benchmarks. The original bytecode size often
shrinks notably during the specialization process in Perl 6 code, as
the argument prelude gets gutted. We do check the size after, but it
will then include any nested inlines, which made us more reluctant to
do multi-level inlines. This could likely be tuned further; for now
this seems a win.

src/spesh/inline.h

@@ -1,5 +1,5 @@
 /* Maximum size of bytecode we'll inline. */
-#define MVM_SPESH_MAX_INLINE_SIZE 256
+#define MVM_SPESH_MAX_INLINE_SIZE 384
 
 /* Inline table entry. The data is primarily used in deopt. */
 struct MVMSpeshInline {