[clang] [CIR] Implement NYI: function declaration that forces code gen (PR #194663)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/test/CIR/CodeGen/force-externally-visibile-def.c clang/lib/CIR/CodeGen/CIRGenModule.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/CodeGen/CIRGenModule.cpp b/clang/lib/CIR/CodeGen/CIRGenModule.cpp
index 230f20971..d746d87ca 100644
--- a/clang/lib/CIR/CodeGen/CIRGenModule.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenModule.cpp
@@ -530,7 +530,7 @@ void CIRGenModule::emitGlobal(clang::GlobalDecl gd) {
       cir::FuncType ty = getTypes().getFunctionType(fi);
 
       getOrCreateCIRFunction(mangledName, ty, gd, /*ForVTable=*/false,
-                              /*DontDefer=*/false);
+                             /*DontDefer=*/false);
       return;
     }
   } else {
@@ -2725,7 +2725,7 @@ void CIRGenModule::setFunctionAttributes(GlobalDecl globalDecl,
   // translation to LLVM. Thus, we don't need to check for them here.
 
   // If this function has a body somewhere in the AST, we must use that
-  // definition for attributes and linkage calculation. This prevents AST 
+  // definition for attributes and linkage calculation. This prevents AST
   // assertions when forcing inline definitions from forward declarations.
   const auto *funcDecl = cast<FunctionDecl>(globalDecl.getDecl());
   const FunctionDecl *fdDef;

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https://github.com/llvm/llvm-project/pull/194663