[AVX512] Fix return types on __builtin_ia32_gather3XivXdi builtins
[AVX512] Fix return types on __builtin_ia32_gather3XivXdi builtins

The return types on the AVX512 __builtin_ia32_gather3XivXdi builtins are incorrect. The return type should match the type of the pass through vector.

Differential Revision: https://reviews.llvm.org/D24785

-This line, and those below, will be ignored--

M    include/clang/Basic/BuiltinsX86.def


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@282082 91177308-0d34-0410-b5e6-96231b3b80d8

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