Merge pull request swiftlang#1171 from shahmishal/swift-2.2-branch

[Preset] Add preset to test all platform

Author: shahmishal

utils/build-presets.ini

@@ -582,3 +582,16 @@ mixin-preset=
 
 release-debuginfo
 assertions
+
+#===------------------------------------------------------------------------===#
+# Test all platforms on OS X builder
+#===------------------------------------------------------------------------===#
+
+[preset: buildbot_all_platforms,tools=RA,stdlib=RA]
+mixin-preset=buildbot_incremental_base
+
+build-subdir=buildbot_incremental
+
+# Build Release without debug info, because it is faster to build.
+release
+assertions