tcg: align static_code_gen_buffer to CODE_GEN_ALIGN

On ia64, the default memory alignement is not enough for a code
alignement. To fix that, force static_code_gen_buffer alignment
to CODE_GEN_ALIGN.
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

exec.c

@@ -498,7 +498,8 @@ static void tlb_unprotect_code_phys(CPUState *env, ram_addr_t ram_addr,
 #endif
 
 #ifdef USE_STATIC_CODE_GEN_BUFFER
-static uint8_t static_code_gen_buffer[DEFAULT_CODE_GEN_BUFFER_SIZE];
+static uint8_t static_code_gen_buffer[DEFAULT_CODE_GEN_BUFFER_SIZE]
+               __attribute__((aligned (CODE_GEN_ALIGN)));
 #endif
 
 static void code_gen_alloc(unsigned long tb_size)