[Autobackout][FunctionalRegression]Revert of change: ee5bffc: Prevent duplicate keys in CEncoder::m_visaUserOptions

This commit changes m_visaUserOptions type from std::vector to
    std::unordered_map to prevent adding duplicate visa option keys.

Author: sys-igc

IGC/Compiler/CISACodeGen/CISABuilder.cpp

@@ -3925,21 +3925,21 @@ namespace IGC
         OptionValue entry;
         entry.type = OpType::ET_BOOL;
         entry.vBool = val;
-        m_visaUserOptions.insert(std::make_pair(option, entry));
+        m_visaUserOptions.push_back(std::make_pair(option, entry));
     }
     void CEncoder::SaveOption(vISAOptions option, uint32_t val)
     {
         OptionValue entry;
         entry.type = OpType::ET_INT32;
         entry.vInt32 = val;
-        m_visaUserOptions.insert(std::make_pair(option, entry));
+        m_visaUserOptions.push_back(std::make_pair(option, entry));
     }
     void CEncoder::SaveOption(vISAOptions option, const char* val)
     {
         OptionValue entry;
         entry.type = OpType::ET_CSTR;
         entry.vCstr = val;
-        m_visaUserOptions.insert(std::make_pair(option, entry));
+        m_visaUserOptions.push_back(std::make_pair(option, entry));
     }
     void CEncoder::SetBuilderOptions(VISABuilder* pbuilder)
     {
@@ -4856,8 +4856,7 @@ namespace IGC
                     // "Auto" mode per kernel function (by user annotation) - use compiler heuristics to determin number of threads per EU
                     SaveOption(vISA_AutoGRFSelection, true);
                 }
-                else if (ClContext->getExpGRFSize() > 0)
-                {
+                else if (ClContext->getExpGRFSize() > 0) {
                     // Explicit GRF size set per module (by compiler option)
                     SaveOption(vISA_TotalGRFNum, ClContext->getExpGRFSize());
                 }

IGC/Compiler/CISACodeGen/CISABuilder.hpp

@@ -812,7 +812,7 @@ namespace IGC
             const char* vCstr;
         };
         // List of vISA user options
-        std::unordered_map<vISAOptions, OptionValue> m_visaUserOptions;
+        std::vector<std::pair<vISAOptions, OptionValue>> m_visaUserOptions;
 
         // Typically IGC just use ones vKernel for every vISA::compile call,
         // in those cases, vKernel and vMainKernel should be the same.