clang-format: Fix alignConsecutiveAssignments.

It wasn't correctly handling this case:

  int oneTwoThree = 123;
  int oneTwo      = 12;
  method();

Review: http://reviews.llvm.org/D12369
Patch by Beren Minor. Thank you!

llvm-svn: 248254
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index e392cf8..8549ec6 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -8540,6 +8540,10 @@
                "int oneTwoThree = 123;\n"
                "int oneTwo      = 12;",
                Alignment);
+  verifyFormat("int oneTwoThree = 123;\n"
+               "int oneTwo      = 12;\n"
+               "method();\n",
+               Alignment);
   verifyFormat("int oneTwoThree = 123; // comment\n"
                "int oneTwo      = 12;  // comment",
                Alignment);