[clang] [CIR] Add math and builtin intrinsics support (PR #175233)

[Hendrik Hübner via cfe-commits]

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+// RUN: %clang_cc1 -triple aarch64-none-linux-android21 -fclangir -emit-cir %s -o %t.cir
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HendrikHuebner wrote:

Maybe move this test file (and the other tests) to `test/CIR/CodeGenBuiltins`?

https://github.com/llvm/llvm-project/pull/175233