[InstCombine] Allow fptrunc (fpext X)) to be reduced to a single fpext/ftrunc

[InstCombine] Allow fptrunc (fpext X)) to be reduced to a single fpext/ftrunc

If we are only truncating bits from the extend we should be able to just use a smaller extend.

If we are truncating more than the extend we should be able to just use a fptrunc since the presense of the fpextend shouldn't affect rounding.

Differential Revision: https://reviews.llvm.org/D43970

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@326595 91177308-0d34-0410-b5e6-96231b3b80d8