Revert "[C++20] [Modules] Always emit the inline builtins"

This reverts commit ca8a411.
This patch broke clang test on Windows x64 msvc

Author: zeroomega

clang/lib/CodeGen/CodeGenModule.cpp

@@ -4022,11 +4022,6 @@ bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
     return true;
 
   const auto *F = cast<FunctionDecl>(GD.getDecl());
-  // Inline builtins declaration must be emitted. They often are fortified
-  // functions.
-  if (F->isInlineBuiltinDeclaration())
-    return true;
-
   if (CodeGenOpts.OptimizationLevel == 0 && !F->hasAttr<AlwaysInlineAttr>())
     return false;
 
@@ -4072,6 +4067,11 @@ bool CodeGenModule::shouldEmitFunction(GlobalDecl GD) {
     }
   }
 
+  // Inline builtins declaration must be emitted. They often are fortified
+  // functions.
+  if (F->isInlineBuiltinDeclaration())
+    return true;
+
   // PR9614. Avoid cases where the source code is lying to us. An available
   // externally function should have an equivalent function somewhere else,
   // but a function that calls itself through asm label/`__builtin_` trickery is