Disable TestIRMemoryMap.test on Windows

It's been pointed out in https://reviews.llvm.org/D47646 that lldb-test
fails to create a usable process on Windows when running this test.

llvm-svn: 333785

lldb/lit/Expr/TestIRMemoryMap.test

@@ -1,3 +1,5 @@
+# REQUIRES: nowindows
+
 # RUN: %cxx %p/Inputs/call-function.cpp -g -o %t
 
 # RUN: lldb-test ir-memory-map %t %S/Inputs/ir-memory-map-basic