Bump MoarVM for Uni fixes and nqp::index 16% speedup in many cases

161ec639 Make string_index 16% faster for incompatible string types
e13c30b7 Use MVMint64 for MVM_string_chr (oplist/function mismatch)
89a9999f Update the README to indicate Unicode 9.0 support
bef5802b Make some fixes to the Unicode data file downloader
fa5158a3 Don't break after ZWJ for Emoji=True + GCB=Other
48371396 Work Hangul grapheme seg into GCB switches
20812a0b Rename is_control_beyond_latin1 to is_control_full
6011f876 Improved debug output for serialization errors
4bc916e2 Fix mixed declarations and code from ccc()
e92ea5a3 Speed up ccc by making ccc_relative using integer prop lookup
90e51577 Reorder conditional in maybe_hangul() to be more clear
06819cce Use GCB instead of HST to avoid property lookup for Hangul
522e005c Actually fix the emoji from commit 4ff2f1f9

Author: samcv

tools/build/MOAR_REVISION

@@ -1 +1 @@
-2017.06-43-g45b008f
+2017.06-56-g161ec639