[build] Add ubsan blacklist file

This adds a copy of tools/ubsan/vptr_blacklist.txt to V8, which is
needed for ubsan compilation.

NOTRY=true
TBR=ishell@chromium.org

Bug: chromium:726584
Change-Id: Ie06a031ce501d7f83121d45b04ac34672eb1ca9e
Reviewed-on: https://chromium-review.googlesource.com/575977
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46760}

tools/ubsan/vptr_blacklist.txt

+#############################################################################
+# UBSan vptr blacklist.
+# Function and type based blacklisting use a mangled name, and it is especially
+# tricky to represent C++ types. For now, any possible changes by name manglings
+# are simply represented as wildcard expressions of regexp, and thus it might be
+# over-blacklisted.