[clang] [CIR][NFC] Use arrangeFunctionDeclaration to build function types (PR #139787)

[Erich Keane via cfe-commits]

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@@ -95,6 +120,34 @@ CIRGenTypes::arrangeFreeFunctionCall(const CallArgList &args,
   return arrangeFreeFunctionLikeCall(*this, cgm, args, fnType);
 }
 
+/// Arrange the argument and result information for the declaration or
+/// definition of the given function.
+const CIRGenFunctionInfo &
+CIRGenTypes::arrangeFunctionDeclaration(const FunctionDecl *fd) {
+  if (const auto *md = dyn_cast<CXXMethodDecl>(fd)) {
+    if (md->isInstance()) {
+      cgm.errorNYI("arrangeFunctionDeclaration: instance method");
+    }
+  }
+
+  CanQualType funcTy = fd->getType()->getCanonicalTypeUnqualified();
+
+  assert(isa<FunctionType>(funcTy));
+  // TODO: setCUDAKernelCallingConvention
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erichkeane wrote:

Isn't that what the `cudaSupport` assert means?

https://github.com/llvm/llvm-project/pull/139787