[clang] [CIR] Correct array-subscript-ordering (PR #227899)

[Erich Keane via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o %t.cir
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erichkeane wrote:

C++17 is our 'default'?  And I don't have any C++17 specific code here, so I didn't really bother.  Though, that shows me there is perhaps value in a C++11 or so run line.

https://github.com/llvm/llvm-project/pull/227899