Never merge < and ::, as it produces different tokens.

Before: vector<::Type> t;
After:  vector< ::Type> t;
llvm-svn: 172601
diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index 9477f5e..939038e 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -1176,6 +1176,10 @@
          Right.is(tok::l_paren) || Right.is(tok::l_brace) ||
          Right.is(tok::kw_true) || Right.is(tok::kw_false)))
       return false;
+    if (Left.is(tok::coloncolon))
+      return false;
+    if (Right.is(tok::coloncolon))
+      return Left.isNot(tok::identifier) && Left.isNot(tok::greater);
     if (Left.is(tok::less) || Right.is(tok::greater) || Right.is(tok::less))
       return false;
     if (Right.is(tok::amp) || Right.is(tok::star))
@@ -1191,10 +1195,6 @@
       return false;
     if (Right.is(tok::l_square) && Right.Type != TT_ObjCMethodExpr)
       return false;
-    if (Left.is(tok::coloncolon) ||
-        (Right.is(tok::coloncolon) &&
-         (Left.is(tok::identifier) || Left.is(tok::greater))))
-      return false;
     if (Left.is(tok::period) || Right.is(tok::period))
       return false;
     if (Left.is(tok::colon))