Introduce the ppc_code_endian_dc() helper which returns the
MemOp endianness for the CODE path.

Use it in need_byteswap(), removing one TARGET_BIG_ENDIAN.

Note, the target MemOp endianness can be evaluated as (see
commit 5c43a750b67 "accel/tcg: Implement translator_ld*_end"):

    MO_TE ^ (do_swap * MO_BSWAP)

For PPC we use the DisasContext::le_mode field to swap the
default (big-endian) order, so to get the PPC MemOp endianness
we can directly use:

    MO_BE ^ (ctx->le_mode * MO_BSWAP)

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
---
 target/ppc/translate.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 17e6d07c8c2..e1753ce19ce 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -214,14 +214,21 @@ static inline bool is_ppe(const DisasContext *ctx)
     return !!(ctx->flags & POWERPC_FLAG_PPE42);
 }
 
+/**
+ * ppc_code_endian_dc:
+ * @dc: the disassembly context
+ *
+ * Return the MemOp endianness of the CODE path.
+ */
+static inline MemOp ppc_code_endian_dc(const DisasContext *ctx)
+{
+    return MO_BE ^ (ctx->le_mode * MO_BSWAP);
+}
+
 /* Return true iff byteswap is needed in a scalar memop */
 static inline bool need_byteswap(const DisasContext *ctx)
 {
-#if TARGET_BIG_ENDIAN
-     return ctx->le_mode;
-#else
-     return !ctx->le_mode;
-#endif
+    return ppc_code_endian_dc(ctx) != MO_TE;
 }
 
 /* True when active word size < size of target_long.  */
-- 
2.52.0