Mark the new tests as unsupported when there are no exceptions

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@313092 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/re/re.alg/re.alg.match/exponential.pass.cpp

@@ -8,7 +8,8 @@
 //===----------------------------------------------------------------------===//
 
 // <regex>
-// XFAIL: c++03
+// UNSUPPORTED: libcpp-no-exceptions
+// UNSUPPORTED: c++03
 
 // template <class BidirectionalIterator, class Allocator, class charT, class traits>
 //     bool

test/std/re/re.alg/re.alg.search/exponential.pass.cpp

@@ -8,7 +8,8 @@
 //===----------------------------------------------------------------------===//
 
 // <regex>
-// XFAIL: c++03
+// UNSUPPORTED: libcpp-no-exceptions
+// UNSUPPORTED: c++03
 
 // template <class BidirectionalIterator, class Allocator, class charT, class traits>
 //     bool