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[AMDGPU] Add implicit vcc_lo on S_CBRANCH_VCCNZ in wave32
* Update skip-if-dead.ll with tests for wave32. * Fix the crash in verifier in one newly enabled test by adding missing fixImplicitOperands in branch insertion code. ``` *** Bad machine code: Using an undefined physical register *** - function: test_kill_divergent_loop - basic block: %bb.2 bb (0xad96308) - instruction: S_CBRANCH_VCCNZ %bb.1, implicit $vcc_lo - operand 1: implicit $vcc_lo LLVM ERROR: Found 1 machine code errors. ``` * Simplify "cbranch_kill" to not use interp instructions. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D96793
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