Add awareness of some Armv8.1-M branch instructions

Armv8.1-M adds some new direct branch instructions. This commit adds
support for parsing WLS, WLSTP, LE, and LETP instructions.

The branch future (BF) family of instructions is not handled by this
commit.

Author: kesyog

decoder/source/i_dec/trc_idec_arminst.cpp

@@ -154,6 +154,16 @@ int inst_Thumb_is_direct_branch_link(uint32_t inst, uint8_t *is_link, uint8_t *i
     } else if ((inst & 0xf5000000) == 0xb1000000) {
         /* CB(NZ) */
         *is_cond = 1;
+    } else if ((inst & 0xfffff001) == 0xf00fc001) {
+        /* LE (encoding T1) */
+    } else if ((inst & 0xfffff001) == 0xf02fc001) {
+        /* LE (encoding T2) */
+    } else if ((inst & 0xfffff001) == 0xf01fc001) {
+        /* LETP (encoding T3) */
+    } else if ((inst & 0xfff0f001) == 0xf040c001) {
+        /* WLS (encoding T1) */
+    } else if ((inst & 0xffc0f001) == 0xf000c001) {
+        /* WLSTP (encoding T3) */
     } else {
         is_direct_branch = 0;
     }
@@ -410,6 +420,26 @@ int inst_Thumb_branch_destination(uint32_t addr, uint32_t inst, uint32_t *pnpc)
         npc = addr + 4 + ((((inst & 0x02000000) << 6) |
                            ((inst & 0x00f80000) << 7)) >> 25);
         npc |= 1;
+    } else if ((inst & 0xfffff001) == 0xf00fc001) {
+        /* LE (encoding T1) */
+        npc = addr + 4 - (((inst & 0x000007fe) << 1) | ((inst & 0x00000800) >> 10));
+        npc |= 1;
+    } else if ((inst & 0xfffff001) == 0xf02fc001) {
+        /* LE (encoding T2) */
+        npc = addr + 4 - (((inst & 0x000007fe) << 1) | ((inst & 0x00000800) >> 10));
+        npc |= 1;
+    } else if ((inst & 0xfffff001) == 0xf01fc001) {
+        /* LETP (encoding T3) */
+        npc = addr + 4 - (((inst & 0x000007fe) << 1) | ((inst & 0x00000800) >> 10));
+        npc |= 1;
+    } else if ((inst & 0xfff0f001) == 0xf040c001) {
+        /* WLS (encoding T1) */
+        npc = addr + 4 + (((inst & 0x000007fe) << 1) | ((inst & 0x00000800) >> 10));
+        npc |= 1;
+    } else if ((inst & 0xffc0f001) == 0xf000c001) {
+        /* WLSTP (encoding T3) */
+        npc = addr + 4 + (((inst & 0x000007fe) << 1) | ((inst & 0x00000800) >> 10));
+        npc |= 1;
     } else {
         is_direct_branch = 0;
     }