gallium: Fix llvmpipe on big-endian machines

Squashed commit of the following:

commit 0857a7e105bfcbc4d1431b2cc56612094c747ca3
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:07 2013 -0400

    gallivm: Fix lp_build_rgba8_to_fi32_soa for big endian

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 0d65131649a8aa140e2db228ba779d685c4333e3
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:07 2013 -0400

    gallivm: Fix big-endian machines

    This adds a bit-shift count to the format table, and adds the concept of
    vector or bitwise alignment on gathers.

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 9740bda9b7dc894b629ed38be9b51059ce90818f
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:07 2013 -0400

    llvmpipe: Fix convert_to_blend_type on big-endian

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit ae037c2de0f029e4e99371c0de25560484f0d8df
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    util: Convert color pack to packed formats

    This fixes them on big-endian.

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 5b05ac0c89ae092ea8ba5bba9f739708d7396b5c
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    graw-xlib: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 51396e7d098cb6ff794391cf11afe4dbf86dbea0
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    format: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 417b60bc66eb450e68a92ab0e47f76e292b385e6
Author: Adam Jackson <ajax@redhat.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    st/dri: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 0934b2e022a5e0847d312c40734e2b44cac52fd8
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    st/xlib: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit a307ea3c3716a706963acce7966b5e405ba11db9
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    gbm: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 53eebdd253e1960a645ea278f31d7ef6a6cf4aeb
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    tests: Convert to packed formats

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 2f77fe3ee524945eacd546efcac34f7799fb3124
Author: Adam Jackson <ajax@redhat.com>
Date:   Tue Jun 18 13:07:37 2013 -0400

    gallium: Document packed formats

    Signed-off-by: Adam Jackson <ajax@redhat.com>

commit 1f1017159ce951f922210a430de9229f91f62714
Author: Richard Sandiford <r.sandiford@uk.ibm.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    gallium: Introduce 32-bit packed format names

    These are for interacting with buffers natively described in terms of
    bit shifts, like X11 visuals:

        uint32_t xyzw8888 = (x << 0) | (y << 8) | (z << 16) | (w << 24);

    Define these in terms of (endian-dependent) aliases to the array-style
    format names.

    Reviewed-by: Adam Jackson <ajax@redhat.com>
    Signed-off-by: Richard Sandiford <r.sandiford@uk.ibm.com>

commit 6cc7ab1ee66ed668da78c1d951dfd7782b4e786a
Author: Adam Jackson <ajax@redhat.com>
Date:   Mon Jun 3 12:10:32 2013 -0400

    gallium: Document format name conventions

    v2:
    - Fix a channel name thinko (Michel Dänzer)
    - Elaborate on SCALED versus INT
    - Add links to DirectX and FOURCC docs

    Signed-off-by: Adam Jackson <ajax@redhat.com>

commit df4d269e7fb62051a3c029b84147465001e5776e
Author: Adam Jackson <ajax@redhat.com>
Date:   Tue Jun 18 12:25:06 2013 -0400

    gallivm: Remove all notion of byte-swapping

    Signed-off-by: Adam Jackson <ajax@redhat.com>

Signed-off-by: Adam Jackson <ajax@redhat.com>
st/dri/sw: Fix pitch calculation in drisw_update_tex_buffer

swrastGetImage rounds the pitch up to 4 bytes for compatibility reasons
that are explained in drisw_glx.c:bytes_per_line, so drisw_update_tex_buffer
must do the same.

Fixes window skew seen while running firefox over vnc on a 16-bit screen.

NOTE: This is a candidate for the stable branches.

[ajax: fixed typo in comment]

Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Richard Sandiford <rsandifo@linux.vnet.ibm.com>
tools/trace: Fix syntax.

Cleaned/commented up the code, but forgot to actually test before
commiting...
tests/graw: Fix typo in shader-leak.c
draw: check for out-of-memory conditions in the AA line module.

To prevent segfaults in the AA line module, the code will check for a
valid pointer to the aaline_stage in the draw context.

Fixes segfault from backtrace:

* aaline_stage_from_pipe
  aaline_delete_fs_state

Reviewed-by: Brian Paul <brianp@vmware.com>