target-alpha improvements, version 4

Changes from v3->v4:
* Use the standard implementation of load-locked/store-conditional. I think it's pretty gross, but probably better to be consistent with the other ports. And at least the port continues to build when the host compiler doesn't support __sync_bool_compare_and_swap.
* Return some value when reading the cycle counter.
* Properly sign-extend cvtlq.

Changes from v2->v3:
* Enable NPTL.

Changes from v1->v2:
* Use setcond and goto_tb.

r~

Richard Henderson (13):
target-alpha: Add flags markups to helpers.h.
target-alpha: Implement cpys{,n,e} inline.
target-alpha: Implement rs/rc properly.
target-alpha: Implement cvtql inline.
target-alpha: Implement cvtlq inline.
target-alpha: Use setcond for int comparisons.
target-alpha: Use non-inverted arguments to gen_{f}cmov.
target-alpha: Emit goto_tb opcodes.
target-alpha: Update commentary for opcode 0x1A.
target-alpha: Enable NPTL.
target-alpha: Indicate NORETURN status when raising exception.
target-alpha: Fix load-locked/store-conditional.
target-alpha: Implement RPCC.

 configure                |    1 +
 linux-user/main.c        |   60 ++++
 linux-user/syscall.c     |    2 +-
 qemu-timer.h             |   13 +
 target-alpha/cpu.h       |   35 ++-
 target-alpha/helper.c    |    7 +-
 target-alpha/helper.h    |  179 +++++------
 target-alpha/op_helper.c |   80 +-----
 target-alpha/translate.c |  802 ++++++++++++++++++++++++++++++----------------
 9 files changed, 713 insertions(+), 466 deletions(-)