[lldb] Skip TestSwiftAsyncUnwindRegisterPressure due to rare timeout

We should investigate why this is timing-out on very rare occasions.

Author: felipepiovezan

lldb/test/API/lang/swift/async/unwind/unwind_register_pressure/TestSwiftAsyncUnwindRegisterPressure.py

@@ -6,6 +6,7 @@
 
 # This test is a best effort attempt at creating a program with high register
 # pressure while also making the linker avoid compact unwind.
+@skipIf(bugnumber='rdar://146182003')
 class TestCase(lldbtest.TestBase):
 
     mydir = lldbtest.TestBase.compute_mydir(__file__)