[clang] [clang] Fix ignoring converted first arg of elementwise_fma (PR #154941)

[Chaitanya Koparkar via cfe-commits]

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@@ -957,3 +957,6 @@ static_assert(fmaDouble1[0] == 5.0);
 static_assert(fmaDouble1[1] == 10.0);
 static_assert(fmaDouble1[2] == 17.0);
 static_assert(fmaDouble1[3] == 26.0);
+
+constexpr float fmaArray[] = {2.0f, 2.0f, 2.0f, 2.0f};
+constexpr float fmaResult = __builtin_elementwise_fma(fmaArray[1], 
fmaArray[2], fmaArray[3]);
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ckoparkar wrote:

Should we also add a `static_assert(fmaResult == 6.0f)` here?

https://github.com/llvm/llvm-project/pull/154941
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