Setting a heading for the section/allocate attribute so that the attribute documentation can be properly generated.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209890 91177308-0d34-0410-b5e6-96231b3b80d8
This test should no longer be XFAILed; the standard has stabilized, and the test contents are acceptable. No diagnostics expected from this test.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209891 91177308-0d34-0410-b5e6-96231b3b80d8
This test is no longer relevant. It is covered already by [basic.scope.pdecl]p10, and our current test for that is more thorough (though our test is named p9.cpp).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209892 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unnecessary test.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@209893 91177308-0d34-0410-b5e6-96231b3b80d8