Bug 1507334 - Add mozconfigs for 3-stage PGO; r=firefox-build-system-reviewers,chmanchester#firefox-build-system-reviewers

These two mozconfigs are used for the 1st and 3rd stages of PGO.
'profile-generate' is used for the 1st stage to generate a firefox
binary with instrumentation enabled. Since it is only used for getting
profile data, we don't run tests against it or need crashreporter
symbol.s

The 'profile-use' mozconfig is for the 3rd and final stage were we
produce the fully optimized build. The profiling information and jarlog
are input artifacts produced by the 2nd stage (running the
profileserver).

Differential Revision: https://phabricator.services.mozilla.com/D15749

--HG--
extra : moz-landing-system : lando

browser/config/mozconfigs/linux64/profile-generate

@@ -0,0 +1,8 @@
+. $topsrcdir/browser/config/mozconfigs/linux64/nightly
+
+mk_add_options "export MOZ_AUTOMATION_BUILD_SYMBOLS=0"
+mk_add_options "export MOZ_AUTOMATION_PACKAGE_TESTS=0"
+mk_add_options "export MOZ_AUTOMATION_PACKAGE_GENERATED_SOURCES=0"
+mk_add_options "export MOZ_AUTOMATION_L10N_CHECK=0"
+
+ac_add_options --enable-profile-generate

browser/config/mozconfigs/linux64/profile-use

@@ -0,0 +1,6 @@
+. $topsrcdir/browser/config/mozconfigs/linux64/nightly
+
+ac_add_options --enable-profile-use
+ac_add_options --enable-lto
+ac_add_options --with-pgo-jarlog=/builds/worker/fetches/en-US.log
+ac_add_options --with-pgo-profile-path=/builds/worker/fetches/default.profraw

moz.build

@@ -124,7 +124,7 @@ if CONFIG['PGO_PROFILE_PATH']:
     ]
     GENERATED_FILES[profdata_gen].script = 'build/merge_profdata.py'
     GENERATED_FILES[profdata_gen].inputs = [
-        CONFIG['PGO_PROFILE_PATH'],
+        '/' + CONFIG['PGO_PROFILE_PATH'],
     ]
 
 DIRS += [