[LV] Remove use of llc from vectoriser tests (#154759) There were 5 X86 loop vectoriser tests that were piping the output from opt into llc. I think in the directory test/Transforms/LoopVectorize we should only be testing the output from the loop vectoriser pass. Any codegen tests should live in test/CodeGen/X86 instead. avx512.ll: it looks like we were really just testing that we generate the right vector length. fp32_to_uint32-cost-model.ll/fp64_to_uint32-cost-model.ll: the tests only seem to care that we're not scalarising the fptoui, so I've modified the test to check for vector ops. I've assumed there are already codegen tests for fptoui vector operations. vectorization-remarks-loopid-dbg.ll: i've copied this test to CodeGen/X86/vectorization-remarks-loopid-dbg.ll for the llc RUN line variant vectorization-remarks.ll: seems to test the same thing as vectorization-remarks-loopid-dbg.ll
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