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arm64: ipred: Make sure all symbols are aligned

If building with debug information enabled, binutils error out with
"unaligned opcodes detected in executable segment", if there are
symbols (even local ones that don't end up in the symbol table)
that point to unaligned addresses in the text section.

This fixes issue #300.

--- a/src/arm/64/ipred.S

+++ b/src/arm/64/ipred.S

@@ -2244,6 +2244,7 @@

         .hword L(ipred_cfl_ac_420_tbl) - L(ipred_cfl_ac_420_w16)

         .hword L(ipred_cfl_ac_420_tbl) - L(ipred_cfl_ac_420_w8)

         .hword L(ipred_cfl_ac_420_tbl) - L(ipred_cfl_ac_420_w4)

+        .hword 0

 L(ipred_cfl_ac_420_w16_tbl):

         .hword L(ipred_cfl_ac_420_w16_tbl) - L(ipred_cfl_ac_420_w16_wpad0)

@@ -2432,6 +2433,7 @@

         .hword L(ipred_cfl_ac_422_tbl) - L(ipred_cfl_ac_422_w16)

         .hword L(ipred_cfl_ac_422_tbl) - L(ipred_cfl_ac_422_w8)

         .hword L(ipred_cfl_ac_422_tbl) - L(ipred_cfl_ac_422_w4)

+        .hword 0

 L(ipred_cfl_ac_422_w16_tbl):

         .hword L(ipred_cfl_ac_422_w16_tbl) - L(ipred_cfl_ac_422_w16_wpad0)