[clang] [llvm] [SPIR-V] Enable variadic function lowering for the SPIR-V target (PR #175076)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/test/CodeGenSPIRV/Builtins/variadic.c clang/lib/CodeGen/Targets/SPIR.cpp clang/test/CodeGen/varargs-with-nonzero-default-address-space.c llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.cpp llvm/lib/Target/SPIRV/SPIRVTargetMachine.cpp llvm/lib/Transforms/IPO/ExpandVariadics.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/IPO/ExpandVariadics.cpp b/llvm/lib/Transforms/IPO/ExpandVariadics.cpp
index 8bbd0a6ab..fb2b1bad9 100644
--- a/llvm/lib/Transforms/IPO/ExpandVariadics.cpp
+++ b/llvm/lib/Transforms/IPO/ExpandVariadics.cpp
@@ -153,8 +153,7 @@ public:
 
   bool rewriteABI() { return Mode == ExpandVariadicsMode::Lowering; }
 
-  template <typename T>
-  bool isValidCallingConv(T *F) {
+  template <typename T> bool isValidCallingConv(T *F) {
     return F->getCallingConv() == CallingConv::C ||
            F->getCallingConv() == CallingConv::SPIR_FUNC;
   }

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https://github.com/llvm/llvm-project/pull/175076