[clang] Remove invalid cases from add_ir_attributes_* AST merge test … #7838

Job	Run time
build-win / Build + LIT	48m 43s
Linux (GCC + no-assertions) / Build + LIT	10m 29s
detect_changes	-1s
macOS / Build	10m 40s
e2e-lin (Intel Arc A-Series Graphics with Level Zero, ["Linux", "arc"]) / Intel Arc A-Series Graphics with Level Zero	13m 4s
e2e-lin (Intel GEN12 Graphics with Level Zero, ["Linux", "gen12"], level_zero:gpu) / Intel GEN12 Graphics with Level Zero	27m 5s
e2e-lin (Perf tests on Intel GEN12 Graphics system, ["Linux", "gen12"], {"LIT_FILTER":"Performanc... / Perf tests on Intel GEN12 Graphics system	3m 17s
e2e-lin (Perf tests on Intel Arc A-Series Graphics system, ["Linux", "arc"], {"LIT_FILTER":"Perfo... / Perf tests on Intel Arc A-Series Graphics system	3m 0s
e2e-lin (SPIR-V Backend / Intel Battlemage Graphics, ["Linux", "bmg"], -u 1001 --device=/dev/dri ... / SPIR-V Backend / Intel Battlemage Graphics	4m 56s
e2e-win / Intel GEN12 Graphics with Level Zero	29m 46s
	2h 30m 59s

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