Remove unused Linux libthread_db callbacks

gdb/proc-service.c includes several libthread_db callbacks that do not
exist in gdb/gdbserver/proc-service.c.  Other than in proc_service.h,
there is no reference to any of these callbacks in any revision of
nptl_db or linuxthreads_db in glibc's git repo so it seems likely that
these functions have never been called.  This commit removes them.

gdb/
2014-07-02  Gary Benson  <gbenson@redhat.com>

	* proc-service.c (ps_xfer_memory): Update comment.
	(ps_pstop): Remove unused function.
	(ps_pcontinue): Likewise.
	(ps_lstop): Likewise.
	(ps_lcontinue): Likewise.
	(ps_lgetxregsize): Likewise.
	(ps_lgetxregs): Likewise.
	(ps_lsetxregs): Likewise.
	(ps_plog): Likewise.
	(ps_ptread): Likewise.
	(ps_ptwrite): Likewise.
Taking an undefined function's address in an executable

doesn't always mean you need to define a function symbol on plt code.
If all references are in read-write sections, then using dynamic relocs
is OK.

bfd/
	* elf32-ppc.c (ppc_elf_adjust_dynamic_symbol): Clear
	pointer_equality_needed when !readonly_dynrelocs.
	* elf64-ppc.c (ppc64_elf_adjust_dynamic_symbol): Likewise.
ld/testsuite/
	* ld-powerpc/ambiguousv1.d: Match symbol table too.
	* ld-powerpc/ambiguousv2.d: Likewise.
	* ld-powerpc/ambiguousv1b.d: New.
	* ld-powerpc/ambiguousv2b.d: New.
	* ld-powerpc/powerpc.exp: Run new tests.
This testcase currently does not handle powerpc branches. It kinda
does in a way, because the arm/aarch64 branch instruction is the
same as powerpc's, but the target triplet pattern is not there.

In summary, the testcase fails to locate the branch offset and causes
a failure and the early termination of the test.

The following patch adds a separate conditional block for powerpc (to keep
things organized), allowing the testcase to continue.

2014-07-02  Luis Machado  <lgustavo@codesourcery.com>

	* gdb.trace/entry-values.exp: Handle powerpc-specific branch
	instruction.
2014-07-02  Jing Yu  <jingyu@google.com>

    Initial patch to enable gold aarch64 backend.

    This patch is just a skeleton which almost does nothing.
    It does not support ILP32 now.

    gold/ChangeLog:
	* aarch64.cc: New file
	* Makefile.am (TARGETSOURCES): Add aarch64.cc
	(ALL_TARGETOBJS): Add aarch64.$(OBJEXT)
	* Makefile.in: Regenerate.
	* configure.tgt: Add entries for aarch64*.
	* configure.ac:  Likewise.
	* configure: Likewise.

    elfcpp/ChangeLog:
	* aarch64.h: New file. New enums for aarch64-elf64 relocations.
	* elfcpp.h (EM_AARCH64, SHT_AARCH64_ATTRIBUTES, PT_AARCH64_ARCHEXT,
	PT_AARCH64_UNWIND): New enum constant.
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