Enable LLVM_FINAL, LLVM_OVERRIDE and LLVM_HAS_VARIADIC_TEMPLATES with more gcc and MSVC versions
Enable LLVM_FINAL, LLVM_OVERRIDE and LLVM_HAS_VARIADIC_TEMPLATES with more gcc and MSVC versions

The 'sealed' definition of LLVM_FINAL can be dropped once VS 2010 is
decommissioned.

Some of this is speculative so will keep an eye on the waterfall -- ping me if
you see failures.

Incremental work towards C++11 migration.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@198399 91177308-0d34-0410-b5e6-96231b3b80d8

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