Limit O1experimental SSA rewrite scope

Author: AnastaZIuk

source/opt/mem_pass.cpp

@@ -60,7 +60,6 @@ bool MemPass::IsTargetType(const Instruction* typeInst) const {
       if (typeInst->IsOpaqueType()) return true;
       break;
     case SSARewriteMode::SpecialTypes:
-      if (typeInst->IsOpaqueType()) return true;
       switch (typeInst->opcode()) {
         case spv::Op::OpTypePointer:
         case spv::Op::OpTypeUntypedPointerKHR:

source/opt/optimizer.cpp

@@ -325,7 +325,6 @@ Optimizer& Optimizer::RegisterPerformancePassesFastCompile(
       .RegisterPass(CreateLocalSingleBlockLoadStoreElimPass())
       .RegisterPass(CreateLocalSingleStoreElimPass())
       .RegisterPass(CreateAggressiveDCEPass(preserve_interface))
-      .RegisterPass(CreateSSARewritePass(SSARewriteMode::SpecialTypes))
       .RegisterPass(CreateAggressiveDCEPass(preserve_interface))
       .RegisterPass(CreateVectorDCEPass())
       .RegisterPass(CreateDeadInsertElimPass())