XFAIL a couple of new <regex> tests for C++03

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@313064 91177308-0d34-0410-b5e6-96231b3b80d8

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

@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 // <regex>
+// XFAIL: c++03
 
 // template <class BidirectionalIterator, class Allocator, class charT, class traits>
 //     bool

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

@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 // <regex>
+// XFAIL: c++03
 
 // template <class BidirectionalIterator, class Allocator, class charT, class traits>
 //     bool