[cleanup] Remove excessive padding from TextTokenRetokenizer::Position
[cleanup] Remove excessive padding from TextTokenRetokenizer::Position

Reorder the fields of the struct TextTokenRetokenizer::Position to remove excessive padding.
Test plan: make -j8 check-clang

Differential revision: https://reviews.llvm.org/D24751


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@281995 91177308-0d34-0410-b5e6-96231b3b80d8

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