[llvm] [NFC][SPIRV] Add AMDGCN SPIR-V specific defaults to the BE (PR #165815)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/MC/SPIRVObjectWriter.cpp llvm/lib/Target/SPIRV/SPIRVSubtarget.cpp llvm/lib/Target/SPIRV/SPIRVTargetMachine.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/MC/SPIRVObjectWriter.cpp b/llvm/lib/MC/SPIRVObjectWriter.cpp
index 82089e566..d693ea33d 100644
--- a/llvm/lib/MC/SPIRVObjectWriter.cpp
+++ b/llvm/lib/MC/SPIRVObjectWriter.cpp
@@ -20,8 +20,8 @@ void SPIRVObjectWriter::writeHeader(const MCAssembler &Asm) {
   constexpr uint32_t GeneratorID = 43;
   const uint32_t GeneratorMagicNumber =
       Asm.getContext().getTargetTriple().getVendor() == Triple::AMD
-        ? UINT16_MAX
-        : ((GeneratorID << 16) | (LLVM_VERSION_MAJOR));
+          ? UINT16_MAX
+          : ((GeneratorID << 16) | (LLVM_VERSION_MAJOR));
   constexpr uint32_t Schema = 0;
 
   W.write<uint32_t>(MagicNumber);

``````````

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https://github.com/llvm/llvm-project/pull/165815