Bug 1557785 - Hook MOZ_PGO_PROFILE_USE environment variable into common Windows mozconfig; r=firefox-build-system-reviewers,chmanchester

MOZ_PGO_PROFILE_USE is set when the use-pgo attribute is defined in the
task. This environment variable is used to enable --enable-profile-use
and related configure flags.

Differential Revision: https://phabricator.services.mozilla.com/D34798

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

build/mozconfig.win-common

@@ -4,3 +4,11 @@
 
 TOOLTOOL_DIR=${TOOLTOOL_DIR:-$topsrcdir}
 export MAKECAB=$TOOLTOOL_DIR/makecab.exe
+
+if [ -z "$USE_ARTIFACT" ]; then
+    if [ -n "$MOZ_PGO_PROFILE_USE" ]; then
+        ac_add_options --enable-profile-use
+        ac_add_options --with-pgo-jarlog="${WORKSPACE}/fetches/en-US.log"
+        ac_add_options --with-pgo-profile-path="${WORKSPACE}/fetches"
+    fi
+fi