[llvm] [NFC][SPIRV] remove unimplemented function define for `selectCross` (PR #134478)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-spir-v

Author: Farzon Lotfi (farzonl)

<details>
<summary>Changes</summary>

- `selectCross` looks to be a function that had its implementation and usage removed but this define some how stuck around.
- this change removes the definition.

---
Full diff: https://github.com/llvm/llvm-project/pull/134478.diff


1 Files Affected:

- (modified) llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp (-2) 


``````````diff
diff --git a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
index 946a295c2df25..662c38ca4ed28 100644
--- a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
@@ -183,8 +183,6 @@ class SPIRVInstructionSelector : public InstructionSelector {
 
   bool selectCmp(Register ResVReg, const SPIRVType *ResType,
                  unsigned comparisonOpcode, MachineInstr &I) const;
-  bool selectCross(Register ResVReg, const SPIRVType *ResType,
-                   MachineInstr &I) const;
   bool selectDiscard(Register ResVReg, const SPIRVType *ResType,
                      MachineInstr &I) const;
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/134478