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1# RUN: not --crash llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=none -filetype=null %s 2>&1 | FileCheck %s2 3---4name: undef_reg_def5tracksRegLiveness: true6body: |7 bb.0:8 ; CHECK: *** Bad machine code: Undef virtual register def operands require a subregister ***9 undef %0:sreg_64 = S_MOV_B64 010 11 ; CHECK: *** Bad machine code: Undef virtual register def operands require a subregister ***12 S_NOP 0, implicit-def undef %1:sreg_6413 S_ENDPGM 0, implicit %0.sub0, implicit %0.sub114 15...16