testsuite: Add nonmoving WAY

This simply runs the compile_and_run tests with `-xn`, enabling the
nonmoving oldest generation.

testsuite/config/ghc

@@ -26,7 +26,8 @@ config.other_ways         = ['prof', 'normal_h',
                              'profllvm', 'profoptllvm', 'profthreadedllvm',
                              'debug',
                              'ghci-ext', 'ghci-ext-prof',
-                             'ext-interp']
+                             'ext-interp',
+                             'nonmoving']
 
 if ghc_with_native_codegen:
     config.compile_ways.append('optasm')
@@ -96,7 +97,8 @@ config.way_flags = {
     'profthreadedllvm' : ['-O', '-prof', '-static', '-fprof-auto', '-threaded', '-fllvm'],
     'ghci-ext'         : ['--interactive', '-v0', '-ignore-dot-ghci', '-fno-ghci-history', '-fexternal-interpreter', '+RTS', '-I0.1', '-RTS'],
     'ghci-ext-prof'    : ['--interactive', '-v0', '-ignore-dot-ghci', '-fno-ghci-history', '-fexternal-interpreter', '-prof', '+RTS', '-I0.1', '-RTS'],
-    'ext-interp' : ['-fexternal-interpreter'],
+    'ext-interp'   : ['-fexternal-interpreter'],
+    'nonmoving'    : ['-debug'],
    }
 
 config.way_rts_flags = {
@@ -135,6 +137,7 @@ config.way_rts_flags = {
     'ghci-ext'         : [],
     'ghci-ext-prof'    : [],
     'ext-interp'       : [],
+    'nonmoving'        : ['-DS', '-xn'],
    }
 
 # Useful classes of ways that can be used with only_ways(), omit_ways() and