internal/rosa/llvm: skip multiple-compile-threads-basic on arm64

This intermittently crashes.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/llvm.go

@@ -97,6 +97,8 @@ func (t Toolchain) newLLVM() (pkg.Artifact, string) {
 		switch runtime.GOARCH {
 		case "arm64":
 			skipChecks = append(skipChecks,
+				// LLVM: intermittently crashes
+				"ExecutionEngine/OrcLazy/multiple-compile-threads-basic.ll",
 				// unwind: unexpectedly passes
 				"unwind_leaffunction",
 			)