tests with picolibc: xfail two remaining tests

Author: domin144

libcxx/test/std/language.support/cmp/cmp.alg/strong_order_long_double.verify.cpp

@@ -12,6 +12,11 @@
 // This test does apply to aarch64 where Arm's AAPCS64 is followed. There they are different sizes.
 // XFAIL: target={{arm64|arm64e|armv(7|8)(l|m)?|powerpc|powerpc64}}-{{.+}}
 
+// In internal LLVM arm BMT tests the target is fixed to "arm-none-eabi", so the
+// "unsupported" cluase above does not work. TODO: find more generic way to
+// detect equal sizes of double and long double
+// XFAIL: LIBCXX-PICOLIBC-FIXME
+
 // MSVC configurations have long double equal to regular double on all
 // architectures.
 // XFAIL: target={{.+}}-pc-windows-msvc

libcxx/test/std/language.support/support.start.term/quick_exit.pass.cpp

@@ -17,6 +17,9 @@
 
 // test quick_exit and at_quick_exit
 
+// TODO: Find out why the at_quick_exit symbol is not found.
+// XFAIL: LIBCXX-PICOLIBC-FIXME
+
 #include <cstdlib>
 
 void f() {}