msp4th: add script to extract opcode definitions

diff --git a/msp4th/opcode-defs.sh b/msp4th/opcode-defs.sh
new file mode 100755 (executable)
index 0000000..14e4fb1
--- /dev/null
+++ b/msp4th/opcode-defs.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+grep '//.*(.*--.*)' msp4th.c