Index: lib/Format/ContinuationIndenter.cpp
===================================================================
--- lib/Format/ContinuationIndenter.cpp
+++ lib/Format/ContinuationIndenter.cpp
@@ -136,8 +136,12 @@
   }
 
   // If binary operators are moved to the next line (including commas for some
-  // styles of constructor initializers), that's always ok.
-  if (!Current.isOneOf(TT_BinaryOperator, tok::comma) &&
+  // styles of constructor initializers), that's always ok. Also the second
+  // element in a sequence of two consecutive string literals is ok to be
+  // moved to the next line.
+  if (!(Current.isOneOf(TT_BinaryOperator, tok::comma) ||
+        (Current.is(tok::string_literal) &&
+         Previous.is(tok::string_literal))) &&
       State.Stack.back().NoLineBreakInOperand)
     return false;
 
Index: unittests/Format/FormatTest.cpp
===================================================================
--- unittests/Format/FormatTest.cpp
+++ unittests/Format/FormatTest.cpp
@@ -4141,6 +4141,14 @@
                "      << \"qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq\";\n"
                "}");
 
+  // The second of two consecutive string literals can be put on a newline.
+  EXPECT_EQ("long_long_long_long\n"
+            "    << long_long_long_long << \"long lo\"\n"
+            "                              \"ng\"",
+            format("long_long_long_long\n"
+                   "    << long_long_long_long << \"long lo\"\n"
+                   "                              \"ng\"",
+                   getLLVMStyleWithColumns(40)));
   // Handle 'endl'.
   verifyFormat("llvm::errs() << aaaaaaaaaaaaaaaaaaaaaa << endl\n"
                "             << bbbbbbbbbbbbbbbbbbbbbb << endl;");