Move jemalloc due to whole_static_library bug.

Rename jemalloc.cpp to jemalloc_wrapper.cpp to avoid problems with
the libc library having two jemalloc.o files that clobber each other.

Change-Id: I9a2d966dbf414b1367ee0ef1f0d73fca6f25b518
diff --git a/libc/Android.mk b/libc/Android.mk
index bc6cf78..2747a3e 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -501,7 +501,7 @@
 
 ifeq ($(MALLOC_IMPL),jemalloc)
   libc_common_cflags += -DUSE_JEMALLOC
-  libc_malloc_src := bionic/jemalloc.cpp
+  libc_malloc_src := bionic/jemalloc_wrapper.cpp
 else
   libc_common_cflags += -DUSE_DLMALLOC
   libc_malloc_src := bionic/dlmalloc.c
diff --git a/libc/bionic/jemalloc.cpp b/libc/bionic/jemalloc_wrapper.cpp
similarity index 100%
rename from libc/bionic/jemalloc.cpp
rename to libc/bionic/jemalloc_wrapper.cpp