[clang] [HLSL] Implementation of the fmod intrinsic (PR #108849)

[Farzon Lotfi via cfe-commits]

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+// RUN: %clang_cc1 -finclude-default-header -triple dxil-pc-shadermodel6.6-library %s -fnative-half-type -emit-llvm-only -disable-llvm-passes -verify -verify-ignore-unexpected
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+float test_too_few_arg() {
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farzonl wrote:

These test cases are fine, but the only two  I was expecting was that `double` exclusion error  defined via `CheckFloatOrHalfRepresentations`  and the # of function args check defined in `clang/lib/Sema/SemaHLSL.cpp`.

Seems like the double exclusion is missing.

https://github.com/llvm/llvm-project/pull/108849