Add tests for three fixed issues (an LLVM crash, an ICE and poor codegen)#155015

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jakubadamw wants to merge 3 commits intorust-lang:mainfrom

jakubadamw:issues-104037-112623-113899

Commits on Apr 9, 2026

Add a test for an LLVM crash "Vector elements must have same size"
jakubadamw
committed
Add a test for a const evaluator ICE on a self-receiver type mismatch
jakubadamw
committed
Add a codegen test for a missed optimisation with spare niches
jakubadamw
committed