[clang-format] Avoid considering include directive as a template closer.

This fixes a bug [[ http://llvm.org/PR48891 | PR48891 ]] introduced in D93839 where:
```
#include <stdint.h>
namespace rep {}
```
got formatted as
```
#include <stdint.h>
namespace rep {
}
```

Reviewed By: MyDeveloperDay, leonardchan

Differential Revision: https://reviews.llvm.org/D95479

Author: mkurdej

clang/lib/Format/UnwrappedLineFormatter.cpp

@@ -371,7 +371,7 @@ class LineJoiner {
         if (Previous->is(tok::comment))
           Previous = Previous->getPreviousNonComment();
         if (Previous) {
-          if (Previous->is(tok::greater))
+          if (Previous->is(tok::greater) && !I[-1]->InPPDirective)
             return 0;
           if (Previous->is(tok::identifier)) {
             const FormatToken *PreviousPrevious =

clang/unittests/Format/FormatTest.cpp

@@ -10248,6 +10248,21 @@ TEST_F(FormatTest, SplitEmptyClass) {
                "{\n"
                "};",
                Style);
+
+  verifyFormat("#include \"stdint.h\"\n"
+               "namespace rep {}",
+               Style);
+  verifyFormat("#include <stdint.h>\n"
+               "namespace rep {}",
+               Style);
+  verifyFormat("#include <stdint.h>\n"
+               "namespace rep {}",
+               "#include <stdint.h>\n"
+               "namespace rep {\n"
+               "\n"
+               "\n"
+               "}",
+               Style);
 }
 
 TEST_F(FormatTest, SplitEmptyStruct) {