Merge lcache into context (#2498)

It is superfluous to maintain multiple globals when the whole
reason of context is to keep them in a single place. It also
simplifies initialization and external context creation a bit.

Also removed unused lcache header includes.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-core/ecma/base/ecma-helpers-string.c

@@ -17,7 +17,6 @@
 #include "ecma-gc.h"
 #include "ecma-globals.h"
 #include "ecma-helpers.h"
-#include "ecma-lcache.h"
 #include "jrt.h"
 #include "jrt-libc-includes.h"
 #include "lit-char-helpers.h"