Updated according to comments from gbt:

Moved the src==dest test out of chpl_gen_comm_get() and into chpl_memcpy().

Adjusted indentation in chpl-cache.c, due to wider function name (chpl_memcpy vs. memcpy).

diff --git a/runtime/include/chpl-comm-compiler-macros.h b/runtime/include/chpl-comm-compiler-macros.h