Fix UBSan blacklist regex containing dash.

BUG=737384

Change-Id: Ib74a5d2aed5cecc758c019e05672fff1f9e3337d
Reviewed-on: https://chromium-review.googlesource.com/572051Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Nicolas Capens <nicolascapens@google.com>
Cr-Commit-Position: refs/heads/master@{#486884}

tools/ubsan/vptr_blacklist.txt

@@ -99,7 +99,7 @@ src:*/third_party/libwebm/source/mkvmuxer.cpp
 #############################################################################
 # LLVM is not UBSan vptr clean.
 src:*third_party/swiftshader/third_party/LLVM*
-src:*third_party/swiftshader/third_party/llvm-subzero*
+src:*third_party/swiftshader/third_party/llvm\-subzero*
 
 #############################################################################
 # UBSan yields false positives in SwiftShader's libEGL when objects created in