[dexter] Temporary disable optnone-simple-functions

D136396 broke optnone-simple-functions. Temporary disabling the test to
unblock the bot until the Sony folks can have a look.

https://green.lab.llvm.org/green/view/LLDB/job/lldb-cmake/47878/

Author: JDevlieghere

cross-project-tests/debuginfo-tests/dexter-tests/optnone-simple-functions.cpp

@@ -5,7 +5,7 @@
 // RUN:     --builder 'clang' --debugger 'lldb' \
 // RUN:     --cflags "-O0 -g" -- %s
 
-// REQUIRES: lldb
+// REQUIRES: lldb, D136396
 // UNSUPPORTED: system-windows
 
 //// Check that the debugging experience with __attribute__((optnone)) at O2