Moving regression tests introduces regresions

### HHVM Version
swalk@lab-3:/data2/swalk/play.020119a/hhvm$ hphp/hhvm/hhvm --version
HipHop VM 4.0.0-dev (rel)
Compiler: heads/master-0-g45a00305d276c6c6dbf2d9df4749e536c861403d
Repo schema: d98dfd5d176fe7a76be657d9bdc162fe9a29f589

### Operating System and Version

swalk@lab-3:/data2/swalk/play.020119a/hhvm$ uname -a
Linux 1scrb-3 4.2.0 #1 SMP Wed Nov 25 14:00:54 CST 2015 aarch64 aarch64 aarch64 GNU/Linux

### Standalone code, or other way to reproduce the problem

hphp/test/run -v -m interp
hphp/test/run -v -m interp -r
hphp/test/run -v -m jit -a '-vEval.JitPGO=0'
hphp/test/run -v -m jit -r -a '-vEval.JitPGO=0'
hphp/test/run -v -m jit -a '-vEval.JitPGO=1'
hphp/test/run -v -m jit -r -a '-vEval.JitPGO=1'

### Actual result

Three tests consistently fail when repo option is used. Post-processed
report below. Columns line up with option sets above.

hphp/test/slow/spec/tests/arrays/arrays.php | . | F | . | F | . | F |
hphp/test/slow/spec/tests/expressions/primary_expressions/intrinsics_list.php | . | F | . | F | . | F |
hphp/test/slow/spec/tests/types/string/numeric_strings.php | . | F | . | F | . | F |

### Expected result

Pass.

Traced to this commit
https://github.com/facebook/hhvm/commit/b873299ca290a4d3c2ef30aedd721b89eff56a1c

This showed up in testing last week. It is still present in a build from this morning.