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[binutils-gdb/gdb-7.12-branch] x32: gdbserver's agent bytecode JIT: fix "call" emission

*** TEST RESULTS FOR COMMIT 7b42e25f7cac78821b6efea2890fe725c59250fc ***

Author: Pedro Alves <palves@redhat.com>
Branch: gdb-7.12-branch
Commit: 7b42e25f7cac78821b6efea2890fe725c59250fc

x32: gdbserver's agent bytecode JIT: fix "call" emission

Running fast tracepoint tests on x32 exposes a latent bug in the agent
bytecode jitting.  There's a code path that forgets to emit the call
opcode...  Whoops.  Fixes a bunch of gdb.trace/trace-condition.exp
FAILs, like:

  (gdb)
  continue
  Continuing.

  Thread 1 "trace-condition" received signal SIGSEGV, Segmentation fault.
  0x7ffec016 in ?? ()
  (gdb) FAIL: gdb.trace/trace-condition.exp: ftrace: $rip == *set_point: advance through tracing

gdb/gdbserver/ChangeLog:
2016-08-23  Pedro Alves  <palves@redhat.com>

	* linux-x86-low.c (amd64_emit_call): Emit missing call opcode.
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