Add license headers to a bunch of libc++ files that were missing them. No functionality change. Fixes 18291. Thanks to Nico for the bug report and the patch.

llvm-svn: 199400
diff --git a/libcxx/include/support/solaris/floatingpoint.h b/libcxx/include/support/solaris/floatingpoint.h
index 21b0349..999d144 100644
--- a/libcxx/include/support/solaris/floatingpoint.h
+++ b/libcxx/include/support/solaris/floatingpoint.h
@@ -1,3 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
 #define atof sun_atof
 #define strtod sun_strtod
 #include_next "floatingpoint.h"
diff --git a/libcxx/include/support/solaris/wchar.h b/libcxx/include/support/solaris/wchar.h
index 05a7241..0e8e660 100644
--- a/libcxx/include/support/solaris/wchar.h
+++ b/libcxx/include/support/solaris/wchar.h
@@ -1,3 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
 #define iswalpha sun_iswalpha
 #define iswupper sun_iswupper
 #define iswlower sun_iswlower
diff --git a/libcxx/include/support/solaris/xlocale.h b/libcxx/include/support/solaris/xlocale.h
index 359508d..875a39a 100644
--- a/libcxx/include/support/solaris/xlocale.h
+++ b/libcxx/include/support/solaris/xlocale.h
@@ -1,3 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
 ////////////////////////////////////////////////////////////////////////////////
 // Minimal xlocale implementation for Solaris.  This implements the subset of
 // the xlocale APIs that libc++ depends on.