charset.c (one_utf8_to_cppchar): Correct mask used for 5-byte UTF-8 sequences.

libcpp:
	* charset.c (one_utf8_to_cppchar): Correct mask used for 5-byte
	UTF-8 sequences.

gcc/testsuite:
	* gcc.dg/cpp/utf8-5byte-1.c: New test.

From-SVN: r147073
diff --git a/libcpp/charset.c b/libcpp/charset.c
index e743b1e..f1da426 100644
--- a/libcpp/charset.c
+++ b/libcpp/charset.c
@@ -169,7 +169,7 @@
 one_utf8_to_cppchar (const uchar **inbufp, size_t *inbytesleftp,
 		     cppchar_t *cp)
 {
-  static const uchar masks[6] = { 0x7F, 0x1F, 0x0F, 0x07, 0x02, 0x01 };
+  static const uchar masks[6] = { 0x7F, 0x1F, 0x0F, 0x07, 0x03, 0x01 };
   static const uchar patns[6] = { 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
 
   cppchar_t c;