clang-format: Don't accidentally move tokens into preprocessor directive.

This fixes llvm.org/PR17265.

Before:
  Foo::Foo()
  #ifdef BAR
      : baz(0)
  #endif {
  }

After:
  Foo::Foo()
  #ifdef BAR
      : baz(0)
  #endif
  {
  }

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190861 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index c5d0171..fc13ad1 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -2226,6 +2226,12 @@
                "        andMoreParameters),\n"
                "    trailing);",
                getLLVMStyleWithColumns(69));
+  verifyFormat("Foo::Foo()\n"
+               "#ifdef BAR\n"
+               "    : baz(0)\n"
+               "#endif\n"
+               "{\n"
+               "}");
 }
 
 TEST_F(FormatTest, LayoutBlockInsideParens) {