[llvm] [Driver] Hook up Haiku ARM support (PR #67222)

[Fangrui Song via llvm-commits]

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@@ -33,6 +33,8 @@
 // RUN:   | FileCheck -check-prefix=CHECK-AAPCS-LINUX %s
 // RUN: %clang -target arm--openbsd- %s -### -o %t.o 2>&1 \
 // RUN:   | FileCheck -check-prefix=CHECK-AAPCS-LINUX %s
+// RUN: %clang -target arm--haiku- %s -### -o %t.o 2>&1 \
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MaskRay wrote:

This check can be moved to `haiku.c`. Having most Haiku-related checks in one place seems cleaner.

https://github.com/llvm/llvm-project/pull/67222