Simplify CT_CCL and CT_STRING inner loop.

Makes no difference to the benchmarks, but does make the code a bit
more readable.

Bug: http://b/68672236
Test: ran tests, benchmarks
Change-Id: I63fa5f78d077c86e4f4f194f2c76ab5510c29109
diff --git a/libc/Android.bp b/libc/Android.bp
index 78fcb12..c81e8e5 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -39,6 +39,7 @@
     "-Wall",
     "-Wextra",
     "-Wunused",
+    "-Wno-char-subscripts",
     "-Wno-deprecated-declarations",
     "-Wno-gcc-compat",
     "-Wframe-larger-than=2048",