Fix windows build (size_t vs. int) some more.

src/ast-value-factory.cc

Index: src/ast-value-factory.cc
diff --git a/src/ast-value-factory.cc b/src/ast-value-factory.cc
index a430dcd308a047ae816b7a8290dfe5ef9253308b..bdc80d14dfb278a98eb7ebf986c77beab6ae7f52 100644
--- a/src/ast-value-factory.cc
+++ b/src/ast-value-factory.cc
@@ -77,7 +77,7 @@ bool AstString::AsArrayIndex(uint32_t* index) const {
 
 
 bool AstString::IsOneByteEqualTo(const char* data) const {
-  int length = strlen(data);
+  int length = static_cast<int>(strlen(data));
   if (is_one_byte_ && literal_bytes_.length() == length) {
     const char* token = reinterpret_cast<const char*>(literal_bytes_.start());
     return !strncmp(token, data, length);