[clang] [clang] Add support for MSVC force inline attrs (PR #185282)

[Matt Arsenault via cfe-commits]

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+// RUN: %clang_cc1 -std=c++23 -emit-llvm %s -triple x86_64-pc-windows-msvc -o - | FileCheck %s
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arsenm wrote:

This should still be changed to disable optimizations, and check for the presence of the alwaysinline attribute in the IR 

https://github.com/llvm/llvm-project/pull/185282