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[AMDGPU] Use v3f32 type in image instructions

Authored by sebastian-ne on Jan 29 2020, 5:04 AM.

Description

[AMDGPU] Use v3f32 type in image instructions

This should lower the amount of used registers for gfx9.

I updated some of the changed tests with the update script because
changing them by hand is tedious.

Differential Revision: https://reviews.llvm.org/D73884