[llvm] [SPIRV] Enable DCE in instruction selection and update tests (PR #168428)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.cpp llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
index d43a92113..f9ddb3efd 100644
--- a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
@@ -650,8 +650,9 @@ bool isDead(const MachineInstr &MI, const MachineRegisterInfo &MRI) {
     return true;
   }
 
-  // It is possible that the only side effect is that the instruction is referenced in the
-  // global registry. If that is the only side effect, the intrinsic is dead.
+  // It is possible that the only side effect is that the instruction is
+  // referenced in the global registry. If that is the only side effect, the
+  // intrinsic is dead.
   if (MI.getOpcode() == TargetOpcode::G_INTRINSIC_W_SIDE_EFFECTS ||
       MI.getOpcode() == TargetOpcode::G_INTRINSIC_CONVERGENT_W_SIDE_EFFECTS) {
     const auto &Intr = cast<GIntrinsic>(MI);

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https://github.com/llvm/llvm-project/pull/168428