With the recent patches applied to RC1 I managed to bootstrap an unregisterised ghc. Running the testsuite I get the following failures on Linux x86_64:

Unexpected failures:
   ../../libraries/base/tests          fixed [bad stdout] (normal)
   ../../libraries/base/tests/Numeric  num010 [bad stdout] (normal)
   ../../libraries/process/tests       process007 [bad exit code] (normal)
   codeGen/should_compile              T7574 [stderr mismatch] (normal)
   codeGen/should_gen_asm              memcpy [asm mismatch] (normal)
   codeGen/should_gen_asm              memcpy-unroll [asm mismatch] (normal)
   codeGen/should_gen_asm              memcpy-unroll-conprop [asm mismatch] (normal)
   codeGen/should_run                  T2838 [bad stdout] (normal)
   lib/integer                         integerBits [bad stdout] (normal)
   lib/integer                         integerConversions [bad stdout] (normal)
   numeric/should_run                  T8726 [bad exit code] (normal)
   numeric/should_run                  arith002 [bad stdout] (normal)
   numeric/should_run                  arith003 [bad stdout] (normal)
   numeric/should_run                  arith004 [bad stdout] (normal)
   numeric/should_run                  arith005 [bad stdout] (normal)
   numeric/should_run                  arith011 [bad stdout] (normal)
   numeric/should_run                  arith012 [bad stdout] (normal)
   numeric/should_run                  arith014 [bad stdout] (normal)
   parser/should_run                   readRun002 [bad stdout] (normal)
   perf/compiler                       T1969 [stat too good] (normal)
   perf/compiler                       T3064 [stat too good] (normal)
   perf/compiler                       T783 [stat too good] (normal)
   perf/should_run                     T3736 [bad stderr] (normal)
   rts                                 T5423 [bad stderr] (normal)
   rts                                 T7815 [bad exit code] (threaded1)
   safeHaskell/check/pkg01             safePkg01 [bad stderr] (normal)