[llvm][SanitizerCoverage] Remove no-op 'ptr addrspace(0)' to 'ptr addrspace(0)' pointercast (NFC)

Opaque ptr cleanup effort.

Author: JOE1994

llvm/lib/Transforms/Instrumentation/SanitizerCoverage.cpp

@@ -329,8 +329,7 @@ ModuleSanitizerCoverage::CreateSecStartEnd(Module &M, const char *Section,
 
   // Account for the fact that on windows-msvc __start_* symbols actually
   // point to a uint64_t before the start of the array.
-  auto SecStartI8Ptr = IRB.CreatePointerCast(SecStart, PtrTy);
-  auto GEP = IRB.CreateGEP(Int8Ty, SecStartI8Ptr,
+  auto GEP = IRB.CreateGEP(Int8Ty, SecStart,
                            ConstantInt::get(IntptrTy, sizeof(uint64_t)));
   return std::make_pair(GEP, SecEnd);
 }
@@ -838,8 +837,7 @@ void ModuleSanitizerCoverage::InjectTraceForSwitch(
           *CurModule, ArrayOfInt64Ty, false, GlobalVariable::InternalLinkage,
           ConstantArray::get(ArrayOfInt64Ty, Initializers),
           "__sancov_gen_cov_switch_values");
-      IRB.CreateCall(SanCovTraceSwitchFunction,
-                     {Cond, IRB.CreatePointerCast(GV, PtrTy)});
+      IRB.CreateCall(SanCovTraceSwitchFunction, {Cond, GV});
     }
   }
 }