[Hexagon] Generate post-increment for floating point types

The code that generates post-increments for Hexagon considered
integer values only. This patch adds support to generate them for
floating point values, f32 and f64.

Differential Revision: https://reviews.llvm.org/D47036


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332748 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed