target-arm: remind to keep arm features in sync with linux-user/elfload.c

Signed-off-by: NBenoit Canet <benoit.canet@gmail.com>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

target-arm/cpu.h

@@ -360,6 +360,10 @@ enum arm_cpu_mode {
 #define ARM_IWMMXT_wCGR2	10
 #define ARM_IWMMXT_wCGR3	11
 
+/* If adding a feature bit which corresponds to a Linux ELF
+ * HWCAP bit, remember to update the feature-bit-to-hwcap
+ * mapping in linux-user/elfload.c:get_elf_hwcap().
+ */
 enum arm_features {
     ARM_FEATURE_VFP,
     ARM_FEATURE_AUXCR,  /* ARM1026 Auxiliary control register.  */