Adapt to change introduced by #122928 in upstream

Change #122928 in LLVM modifies the signature of createObjectPointerType
in a backwards incompatible fashion; this adapts the translator's single
use of that interface to match the new signature, whilst retaining existing
behaviour.

C-p'ed from KhronosGroup/SPIRV-LLVM-Translator#2965

lib/SPIRV/SPIRVToLLVMDbgTran.cpp

@@ -330,7 +330,7 @@ DIType *SPIRVToLLVMDbgTran::transTypePointer(const SPIRVExtInst *DebugInst) {
         PointeeTy, BM->getAddressingModel() * 32, 0, AS);
 
   if (Flags & SPIRVDebug::FlagIsObjectPointer)
-    Ty = getDIBuilder(DebugInst).createObjectPointerType(Ty);
+    Ty = getDIBuilder(DebugInst).createObjectPointerType(Ty, /*Implicit=*/true);
   else if (Flags & SPIRVDebug::FlagIsArtificial)
     Ty = getDIBuilder(DebugInst).createArtificialType(Ty);