system: Allow restricting the legacy MO_TE* 'native-endian' definitions

Guard the native endian definitions we want to remove by surrounding
them with TARGET_NOT_USING_LEGACY_NATIVE_ENDIAN_API #ifdef'ry.

Once a target gets cleaned we'll set the definition in the
target config, then the target won't be able to use the legacy
API anymore.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20260109165058.59144-20-philmd@linaro.org>

include/exec/memop.h

@@ -36,11 +36,13 @@ typedef enum MemOp {
     MO_BE    = MO_BSWAP,
 #endif
 #ifdef COMPILING_PER_TARGET
+#ifndef TARGET_NOT_USING_LEGACY_NATIVE_ENDIAN_API
 #if TARGET_BIG_ENDIAN
     MO_TE    = MO_BE,
 #else
     MO_TE    = MO_LE,
 #endif
+#endif
 #endif
 
     /*
@@ -150,6 +152,7 @@ typedef enum MemOp {
     MO_BESQ  = MO_BE | MO_SQ,
 
 #ifdef COMPILING_PER_TARGET
+#ifndef TARGET_NOT_USING_LEGACY_NATIVE_ENDIAN_API
     MO_TEUW  = MO_TE | MO_UW,
     MO_TEUL  = MO_TE | MO_UL,
     MO_TEUQ  = MO_TE | MO_UQ,
@@ -157,6 +160,7 @@ typedef enum MemOp {
     MO_TESW  = MO_TE | MO_SW,
     MO_TESL  = MO_TE | MO_SL,
     MO_TESQ  = MO_TE | MO_SQ,
+#endif
 #endif
 
     MO_SSIZE = MO_SIZE | MO_SIGN,