userland: add assembly support

Move arm assembly cheat here, and start some work on x86 cheat as well.

userland/arch/arm/beq.S

@@ -0,0 +1,28 @@
+/* https://github.com/cirosantilli/arm-assembly-cheat#beq */
+
+#include "common.h"
+
+ENTRY
+
+    /* Smaller*/
+    mov r0, 1
+    cmp r0, 2
+    ASSERT(ble)
+    ASSERT(blt)
+    ASSERT(bne)
+
+    /* Equal. */
+    mov r1, 0
+    cmp r1, 0
+    ASSERT(beq)
+    ASSERT(bge)
+    ASSERT(ble)
+
+    /* Greater. */
+    mov r0, 2
+    cmp r0, 1
+    ASSERT(bge)
+    ASSERT(bgt)
+    ASSERT(bne)
+
+EXIT