clang-format: Improve format of calls with several lambdas.

Before:
  SomeFunction([]() {
                 int i = 42;
                 return i;
               },
               []() {
    int j = 43;
    return j;
  });

After:
  SomeFunction([]() {
                 int i = 42;
                 return i;
               },
               []() {
                 int j = 43;
                 return j;
               });

llvm-svn: 205848