remove passing tests from being XFAILED, change some race conditions back to UNSUPPORTED

Author: abhina-sree

libcxx/test/std/language.support/support.rtti/type.info/type_info.equal.pass.cpp

@@ -12,10 +12,6 @@
 
 // UNSUPPORTED: no-rtti
 
-// When we build for Windows on top of the VC runtime, `typeinfo::operator==` may not
-// be `constexpr` (depending on the version of the VC runtime). So this test can fail.
-// XFAIL: target={{.+}}-windows-msvc && !libcpp-no-vcruntime
-
 #include <typeinfo>
 #include <cassert>
 

libcxx/test/std/thread/futures/futures.async/async_race.38682.pass.cpp

@@ -11,7 +11,7 @@
 
 // There's currently no release of OS X whose dylib contains the patch for
 // PR38682. Since the fix for future<void> is in the dylib, this test may fail.
-// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11|12|13|14}}
 
 // This test is designed to cause and allow TSAN to detect a race condition
 // in std::async, as reported in https://llvm.org/PR38682.

libcxx/test/std/thread/futures/futures.future_error/what.pass.cpp

@@ -13,10 +13,6 @@
 //
 // XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{9|10|11}}
 
-// VC Runtime's std::exception::what() method is not marked as noexcept, so
-// this fails.
-// XFAIL: target=x86_64-pc-windows-msvc && !libcpp-no-vcruntime
-
 // <future>
 //
 // class future_error

libcxx/test/std/thread/thread.condition/notify_all_at_thread_exit_lwg3343.pass.cpp

@@ -14,8 +14,8 @@
 // The fix of LWG3343 is done in the dylib. That means Apple backdeployment
 // targets remain broken. Due to the nature of the test, testing on a broken
 // system does not guarantee that the test fails, so the test can't use XFAIL.
-// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{.+}}
-// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx11.{{.+}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx10.{{.+}}
+// UNSUPPORTED: stdlib=apple-libc++ && target={{.+}}-apple-macosx11.{{.+}}
 
 // This is a regression test for LWG3343.
 //

libcxx/test/std/utilities/format/format.functions/escaped_output.unicode.pass.cpp

@@ -11,9 +11,6 @@
 // This version runs the test when the platform has Unicode support.
 // UNSUPPORTED: libcpp-has-no-unicode
 
-// TODO FMT Investigate Windows issues.
-// XFAIL: target={{.+}}-windows-gnu
-
 // TODO FMT This test should not require std::to_chars(floating-point)
 // XFAIL: availability-fp_to_chars-missing
 

libcxx/test/std/utilities/format/format.range/format.range.fmtstr/format.pass.cpp

@@ -7,9 +7,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
-// TODO FMT Investigate why this fails.
-// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>

libcxx/test/std/utilities/format/format.range/format.range.fmtstr/parse.pass.cpp

@@ -7,9 +7,6 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
 
-// TODO FMT Investigate why this fails.
-// XFAIL: stdlib=apple-libc++ && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
-
 // <format>
 
 // template<ranges::input_range R, class charT>