[AMDGPU][mc] Fix ds_min/max[_rtn]_f32 - extra source operand removed.

Fixes Bug 28215. Lit tests updated.

Differential Revision: https://reviews.llvm.org/D25837

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284825 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed