Revert "subroutine int64 div/rem emulation"

This reverts commit 0402b7d.

(cherry picked from commit 3080cd9)

Author: pkwasnie-intel

IGC/Compiler/Optimizer/PreCompiledFuncImport.cpp

@@ -2547,7 +2547,6 @@ void PreCompiledFuncImport::checkAndSetEnableSubroutine()
     bool SPDiv = isSPDiv();
     bool DPEmu = isDPEmu();
     bool DPDivSqrtEmu = isDPDivSqrtEmu();
-    bool I64DivRem = isI64DivRem();
 
     Module* M = m_pCtx->getModule();
     for (auto FI = M->begin(), FE = M->end(); FI != FE; ++FI)
@@ -2590,15 +2589,6 @@ void PreCompiledFuncImport::checkAndSetEnableSubroutine()
                     m_enableCallForEmulation = true;
                 }
                 break;
-            case Instruction::UDiv:
-            case Instruction::URem:
-            case Instruction::SDiv:
-            case Instruction::SRem:
-                if (I64DivRem && I->getOperand(0)->getType()->isIntegerTy(64))
-                {
-                    m_enableCallForEmulation = true;
-                }
-                break;
             }
 
             GenIntrinsicInst* GII = dyn_cast<GenIntrinsicInst>(I);