Address compilation warnings for android build.

src/parsing/scanner.h

Index: src/parsing/scanner.h
diff --git a/src/parsing/scanner.h b/src/parsing/scanner.h
index 610091c52ec51fe52af9241dba844359a429585b..c1c799397f5f711d91e7e103905a95f40d1f5fd2 100644
--- a/src/parsing/scanner.h
+++ b/src/parsing/scanner.h
@@ -162,7 +162,7 @@ class LiteralBuffer {
   INLINE(void AddChar(char code_unit)) {
     if (position_ >= backing_store_.length()) ExpandBuffer();
     DCHECK(is_one_byte_);
-    DCHECK(0 <= code_unit && code_unit <= kMaxAscii);
+    DCHECK(iscntrl(code_unit) || isprint(code_unit));

[vogelheim, 2016/07/11 07:42:49]

Hrm. I searched for several minutes until I had found suitable defintions for
iscntrl and isprint, so I could determine whether this is correct. The good news
is, of course it's correct.

The bad news is, it took me quite a bit to figure that out.

Can we have a warning-free version that just checks upper & lower bounds?

     backing_store_[position_] = static_cast<byte>(code_unit);
     position_ += kOneByteSize;
     return;