[Sema] Check FunctionDecl has identifier before getName.

[python3kgae]

Use identifier name without check the identifier exists will cause crash.

Fixes #6426

[bob80905]

For your test case, I would think only one function declaration is needed. Is it possible to get rid of the rest of them?

[github-actions]

⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command:

git-clang-format --diff 6f4f758e9b3be1991956f99600982755596e29dc 176e467ed36741b9d9f2c13ea6bb9666ab66af5c -- tools/clang/lib/Sema/SemaHLSL.cpp

View the diff from clang-format here.

diff --git a/tools/clang/lib/Sema/SemaHLSL.cpp b/tools/clang/lib/Sema/SemaHLSL.cpp
index 3646e35d8..4f3caee35 100644
--- a/tools/clang/lib/Sema/SemaHLSL.cpp
+++ b/tools/clang/lib/Sema/SemaHLSL.cpp
@@ -15690,7 +15690,8 @@ void TryAddShaderAttrFromTargetProfile(Sema &S, FunctionDecl *FD,
 
   // if this FD isn't the entry point, then we shouldn't add
   // a shader attribute to this decl, so just return
-  if (!FD->getIdentifier() || EntryPointName != FD->getIdentifier()->getName()) {
+  if (!FD->getIdentifier() ||
+      EntryPointName != FD->getIdentifier()->getName()) {
     return;
   }
 

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[tex3d]

LGTM.