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x86-64: Do msac refill before calling dav1d_msac_init_x86()

Allows for constant propagation and tail call elimination in the
msac initialization, which is performed in each tile.

--- a/src/msac.c

+++ b/src/msac.c

@@ -198,6 +198,7 @@

     s->rng = 0x8000;

     s->cnt = -15;

     s->allow_update_cdf = !disable_cdf_update_flag;

+    ctx_refill(s);

 #if ARCH_X86_64 && HAVE_ASM

     s->symbol_adapt16 = dav1d_msac_decode_symbol_adapt_c;

@@ -204,6 +205,4 @@

     dav1d_msac_init_x86(s);

 #endif

-

-    ctx_refill(s);

 }