Adding missing include to fix interpreted regexp build.

BUG=None
LOG=None
R=mtrofin@chromium.org

Review-Url: https://codereview.chromium.org/2621373005
Cr-Commit-Position: refs/heads/master@{#42299}

test/cctest/test-regexp.cc

@@ -34,10 +34,11 @@
 
 #include "src/ast/ast.h"
 #include "src/char-predicates-inl.h"
+#include "src/objects-inl.h"
 #include "src/ostreams.h"
 #include "src/regexp/jsregexp.h"
-#include "src/regexp/regexp-macro-assembler.h"
 #include "src/regexp/regexp-macro-assembler-irregexp.h"
+#include "src/regexp/regexp-macro-assembler.h"
 #include "src/regexp/regexp-parser.h"
 #include "src/splay-tree-inl.h"
 #include "src/string-stream.h"