gpu: Fix llvmpipe render string regex for llvmpipe >= 0.5

Before 0.5, render strings looked like this:

    Gallium 0.4 on llvmpipe (LLVM 4.0, 256 bits)

now they look like this:

    llvmpipe (LLVM 5.0, 256 bits)

Change the regex accordingly to avoid accidentally not matching
the llvmpipe renderer string.

Bug: 854437
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I14a7a7631880b2dcfcd3af5eeb6c01d5be32edb6
Reviewed-on: https://chromium-review.googlesource.com/1108216
Commit-Queue: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569747}

AUTHORS

@@ -611,6 +611,7 @@ Nedeljko Babic <nedeljko.babic@imgtec.com>
 Nikhil Bansal <n.bansal@samsung.com>
 Nikhil Sahni <nikhil.sahni@samsung.com>
 Nikita Ofitserov <himikof@gmail.com>
+Niklas Hambüchen <mail@nh2.me>
 Niklas Schulze <me@jns.io>
 Nikola Kovacs <nikola.kovacs@gmail.com>
 Nils Schneider <nils.schneider@gmail.com>

gpu/config/software_rendering_list.json

@@ -410,7 +410,7 @@
             "op": ">=",
             "value": "10.1.3"
           },
-          "gl_renderer": ".*Gallium.*llvmpipe.*"
+          "gl_renderer": ".*llvmpipe.*"
         }
       ],
       "features": [
@@ -969,7 +969,7 @@
       },
       "driver_vendor": "Mesa",
       "gl_vendor": "VMware.*",
-      "gl_renderer": ".*Gallium.*llvmpipe.*",
+      "gl_renderer": ".*llvmpipe.*",
       "features": [
         "all",
         {"exceptions": [
@@ -1322,7 +1322,7 @@
           "gl_renderer": ".*SVGA3D.*"
         },
         {
-          "gl_renderer": ".*Gallium.*llvmpipe.*"
+          "gl_renderer": ".*llvmpipe.*"
         },
         {
           "gl_renderer": "Mesa OffScreen"