Build/Test Tools: Remove mentions of HHVM from the test infrastructure on Travis for the 4.4 branch.

See #40548


git-svn-id: https://develop.svn.wordpress.org/branches/4.4@40829 602fd350-edb4-49c9-b593-d223f7449a82

.travis.yml

@@ -37,7 +37,7 @@ before_install:
   fi
 before_script:
 - |
-  # Remove Xdebug for a huge performance increase, but not from nightly or hhvm:
+  # Remove Xdebug for a huge performance increase, but not from nightly:
   stable='^[0-9\.]+$'
   if [[ "$TRAVIS_PHP_VERSION" =~ $stable ]]; then
     phpenv config-rm xdebug.ini
@@ -52,7 +52,7 @@ before_script:
   # Install the specified version of PHPUnit depending on the PHP version:
   if [[ "$WP_TRAVISCI" == "travis:phpunit" ]]; then
     case "$TRAVIS_PHP_VERSION" in
-      7.1|7.0|hhvm|nightly)
+      7.1|7.0|nightly)
         echo "Using PHPUnit 5.7"
         composer global require "phpunit/phpunit=5.7.*"
         ;;
@@ -77,11 +77,7 @@ before_script:
 - npm install
 - npm prune
 - php --version
-- |
-  # Debug PHP extensions, but not on HHVM because the command hangs indefinitely:
-  if [[ "$TRAVIS_PHP_VERSION" != 'hhvm' ]]; then
-    php -m
-  fi
+- php -m
 - npm --version
 - node --version
 - which phpunit