[NFC][SPIRV] remove unimplemented function define for selectCross

[farzonl]

• 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.

[llvmbot]

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

Author: Farzon Lotfi (farzonl)

Changes

• 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 --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;