Fix function declaration behavior.

This only affects styles that prevent bin packing. There, a break after
a template declaration also forced a line break after the function name.

Before:
template <class SomeType, class SomeOtherType>
SomeType
SomeFunction(SomeType Type, SomeOtherType OtherType) {}

After:
template <class SomeType, class SomeOtherType>
SomeType SomeFunction(SomeType Type, SomeOtherType OtherType) {}

This fixes llvm.org/PR16072.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182457 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/Format.cpp

@@ -251,7 +251,7 @@ public:
     State.Column = FirstIndent;
     State.NextToken = &RootToken;
     State.Stack.push_back(
-        ParenState(FirstIndent, FirstIndent, !Style.BinPackParameters,
+        ParenState(FirstIndent, FirstIndent, /*AvoidBinPacking=*/ false,
                    /*NoLineBreak=*/ false));
     State.LineContainsContinuedForLoopSection = false;
     State.ParenLevel = 0;

unittests/Format/FormatTest.cpp

@@ -2077,6 +2077,10 @@ TEST_F(FormatTest, FormatsOneParameterPerLineIfNecessary) {
       "      .aaaaaaa();\n"
       "}",
       NoBinPacking);
+  verifyFormat(
+      "template <class SomeType, class SomeOtherType>\n"
+      "SomeType SomeFunction(SomeType Type, SomeOtherType OtherType) {}",
+      NoBinPacking);
 }
 
 TEST_F(FormatTest, FormatsBuilderPattern) {