[Bindings] Remove duplicate declaration

[tamird]

Summary

a27771b62f2f8c399ed8fac124810a273226d5d5 moved
LLVMAddInstructionCombiningPass but neglected to remove the previous
declaration, resulting in a duplicate.

This is harmless in C, but can cause problems downstream if e.g. code is
generated from these bindings.

This function is removed on master, so this commit is made against
release/16.x.

[dblaikie]

SGTM, though I don't quite understand the "This function is removed on master, so this commit is made against release/16.x." comment?

Oh, the function's entirely removed, but you need a fix in 16.x - @tstellar are you still managing point releases, or can point this patch to who is? I don't know what the protocol is for patching the releases/approving release-branch-only patches.

[tstellar]

We aren't accepting release/16.x patches any more.

llvm/include/llvm-c/Transforms/Scalar.h

 void LLVMAddGVNPass(LLVMPassManagerRef PM);
 
 /** See llvm::createGVNPass function. */
 void LLVMAddNewGVNPass(LLVMPassManagerRef PM);
 
 /** See llvm::createIndVarSimplifyPass function. */
 void LLVMAddIndVarSimplifyPass(LLVMPassManagerRef PM);
 
-/** See llvm::createInstructionCombiningPass function. */
-void LLVMAddInstructionCombiningPass(LLVMPassManagerRef PM);
-
 /** See llvm::createInstSimplifyLegacyPass function. */
 void LLVMAddInstructionSimplifyPass(LLVMPassManagerRef PM);
 
 /** See llvm::createJumpThreadingPass function. */
 void LLVMAddJumpThreadingPass(LLVMPassManagerRef PM);
 
 /** See llvm::createLICMPass function. */
 void LLVMAddLICMPass(LLVMPassManagerRef PM);