[llvm] [SPIRV] Fix global emission for modules with no functions (PR #183833)

[Juan Manuel Martinez Caamaño via llvm-commits]

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@@ -2668,6 +2668,11 @@ static void addMBBNames(const Module &M, const SPIRVInstrInfo &TII,
     MachineFunction *MF = MMI->getMachineFunction(F);
     if (!MF)
       continue;
+    if (MF->getFunction()
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jmmartinez wrote:

This should be done in a separate PR.

https://github.com/llvm/llvm-project/pull/183833