Replace atomic_load_store.template with atomic_load and atomic_store ones
(code refactoring)

* src/Makefile.am (EXTRA_DIST): Replace atomic_load_store.template
entry with atomic_load.template and atomic_store.template.
* src/Makefile.am (BUILT_SOURCES): Replace atomic_load_store.h,
char_atomic_load_store.h, int_atomic_load_store.h,
short_atomic_load_store.h entries with atomic_load.h, atomic_store.h,
char_atomic_load.h, char_atomic_store.h, int_atomic_load.h,
int_atomic_store.h, short_atomic_load.h, short_atomic_store.h,
respectively.
* src/Makefile.am (atomic_ops/sysdeps/loadstore/atomic_load_store.h,
atomic_ops/sysdeps/loadstore/char_atomic_load_store.h,
atomic_ops/sysdeps/loadstore/int_atomic_load_store.h,
atomic_ops/sysdeps/loadstore/short_atomic_load_store.h): Replace with
atomic_ops/sysdeps/loadstore/<T>_atomic_load.h and
atomic_ops/sysdeps/loadstore/<T>_atomic_store.h rules.
* src/atomic_ops/sysdeps/all_aligned_atomic_load_store.h: Include
all <T>_atomic_load.h and <T>_atomic_store.h instead of all removed
<T>_atomic_load_store.h files.
* src/atomic_ops/sysdeps/all_atomic_load_store.h: Likewise.
* src/atomic_ops/sysdeps/gcc/alpha.h: Include atomic_load.h and
atomic_store.h instead of removed atomic_load_store.h file.
* src/atomic_ops/sysdeps/hpc/hppa.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/atomic_load.template: New template
file (half of code copied from atomic_load_store.template).
* src/atomic_ops/sysdeps/loadstore/atomic_store.template: Likewise.
* src/atomic_ops/sysdeps/loadstore/atomic_load_store.template: Remove
file.
* src/atomic_ops/sysdeps/loadstore/atomic_load_store.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/char_atomic_load_store.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/int_atomic_load_store.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/short_atomic_load_store.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/atomic_load.h: Regenerate.
* src/atomic_ops/sysdeps/loadstore/atomic_store.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/char_atomic_load.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/char_atomic_store.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/int_atomic_load.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/int_atomic_store.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/short_atomic_load.h: Likewise.
* src/atomic_ops/sysdeps/loadstore/short_atomic_store.h: Likewise.