[lldb][test] Skip TestSwiftAsyncBacktraceLocals as intermittently failing

rdar://162712775

Author: AnthonyLatsis

lldb/test/API/lang/swift/async/unwind/backtrace_locals/TestSwiftAsyncBacktraceLocals.py

@@ -3,7 +3,7 @@
 import lldbsuite.test.lldbtest as lldbtest
 import lldbsuite.test.lldbutil as lldbutil
 
-
+@skipIf(bugnumber="rdar://162712775")
 class TestSwiftAsyncBacktraceLocals(lldbtest.TestBase):
 
     mydir = lldbtest.TestBase.compute_mydir(__file__)