LLVM 20: Update for getFirstNonPHIOrDbg. #601

Job	Run time
Call PR testing on schedule / run_clang_format	9s
Call PR testing on schedule / run_riscv_m1	11m 49s
Call PR testing on schedule / run_host_x86_64	20m 7s
Call PR testing on schedule / run_clang_tidy_changes	3m 1s
Call PR testing on schedule / run_ubuntu_gcc_x86_64_riscv_fp16_cl3_0_unitcl_vecz	39m 46s
Call PR testing on schedule / run_windows_msvc_x86_64_llvm_latest_cl3_0_offline	41m 46s
Call PR testing on schedule / run-ubuntu-clang-x86-llvm-latest-cl3-0-offline	30m 11s
Call PR testing on schedule / run-ubuntu-gcc-aarch64-llvm-latest-cl3-0-fp16	5m 57s
Call PR testing on schedule / run-ubuntu-gcc-x86_64-clik-refsi	2m 29s
Call PR testing on schedule / run-ubuntu-gcc-x86_64-refsi-g1-wi-cl3-0	0s
Call PR testing on schedule / run-ubuntu-gcc-x86_64-riscv-fp16-cl3-0	32m 20s
Call PR testing on schedule / run-ubuntu-gcc-x86-llvm-latest-x86_64-images-cl3-0-release	31m 9s
	3h 38m 44s

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