ART: minor fix for no-opt debug builds

Works around missing symbol definition for debug builds with no
optimization.

Test: ART_BUILD_HOST_DEBUG=1 ART_BUILD_TARGET_DEBUG=1 \
      ART_DEBUG_OPT_FLAG=-O0 m -j32
Change-Id: I16f2c73855ec49b055e531b91bfdb4450bd0dc8e
diff --git a/libartbase/base/bit_table.h b/libartbase/base/bit_table.h
index b0fc4d1..d7f1fcf 100644
--- a/libartbase/base/bit_table.h
+++ b/libartbase/base/bit_table.h
@@ -246,6 +246,9 @@
   class Entry {
    public:
     Entry() {
+      // The definition of kNoValue here is for host and target debug builds which complain about
+      // missing a symbol definition for BitTableBase<N>::kNovValue when optimization is off.
+      static constexpr uint32_t kNoValue = BitTableBase<kNumColumns>::kNoValue;
       std::fill_n(data_, kNumColumns, kNoValue);
     }