[Darwin][iOS] Enable test on non-macOS platforms

We are now using a properly-substituted minimal deployment target
compiler flag (`%min_macos_deployment_target=10.11`).  Enable test on
iOS and watchOS plus simulators.  We are also not testing on very old
platforms anymore, so we can remove some obsolete lit infrastructure.

compiler-rt/test/asan/TestCases/initialization-bug.cpp

@@ -8,10 +8,6 @@
 // FIXME: https://code.google.com/p/address-sanitizer/issues/detail?id=186
 // XFAIL: windows-msvc
 
-// The test is expected to fail on OS X Yosemite and older
-// UNSUPPORTED: osx-no-ld64-live_support
-// UNSUPPORTED: ios
-
 #include <cstdio>
 
 // The structure of the test is:

compiler-rt/test/lit.common.cfg.py

@@ -281,12 +281,6 @@ if config.host_os == 'Darwin':
     if osx_version >= (10, 11):
       config.available_features.add('osx-autointerception')
       config.available_features.add('osx-ld64-live_support')
-    else:
-      # The ASAN initialization-bug.cpp test should XFAIL on OS X systems
-      # older than El Capitan. By marking the test as being unsupported with
-      # this "feature", we can pass the test on newer OS X versions and other
-      # platforms.
-      config.available_features.add('osx-no-ld64-live_support')
   except subprocess.CalledProcessError:
     pass