adds ISR check that is closer to productive code

This approach patches the existing trap handler to call the test routine

test/threadx/generate_trap_file.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -eu
+
+src="$1"
+dst="$2"
+
+extern_anchor='extern void _tx_timer_interrupt(void);'
+call_anchor='_tx_timer_interrupt();'
+
+line=$(grep -n -F "$extern_anchor" "$src" | head -n 1 | cut -d: -f1)
+if [ -z "$line" ]; then
+    echo "failed to find _tx_timer_interrupt declaration anchor in trap source" >&2
+    exit 1
+fi
+sed "${line}a\\
+extern void test_interrupt_dispatch(void);" "$src" > "$dst.tmp1"
+
+line=$(grep -n -F "$call_anchor" "$dst.tmp1" | head -n 1 | cut -d: -f1)
+if [ -z "$line" ]; then
+    echo "failed to find _tx_timer_interrupt call anchor in trap source" >&2
+    rm -f "$dst.tmp1"
+    exit 1
+fi
+mkdir -p "$(dirname "$dst")"
+sed "${line}i\\
+                test_interrupt_dispatch();" "$dst.tmp1" > "$dst"
+rm -f "$dst.tmp1"