Remove FixFastMathFlags workaround.

FixFastMathFlags is workaround that sets AllowContract and ApproxFunc flags
in case allowReassoc flag was set for this instruction.
It is necessary to remove this pass, as AllowContract and ApproxFunc flags
must be supported in the frontend.

Author: ppogotov

IGC/AdaptorOCL/UnifyIROCL.cpp

@@ -116,7 +116,6 @@ SPDX-License-Identifier: MIT
 #include "Compiler/FixResourcePtr.hpp"
 #include "Compiler/InitializePasses.h"
 #include "Compiler/MetaDataApi/SpirMetaDataApi.h"
-#include "Compiler/Optimizer/FixFastMathFlags.hpp"
 #include "Compiler/Optimizer/ReduceOptPass.hpp"
 #include "Compiler/CustomUnsafeOptPass.hpp"
 #include "MoveStaticAllocas.h"

IGC/Compiler/InitializePasses.h

@@ -221,7 +221,6 @@ void initializeCheckInstrTypesPass(llvm::PassRegistry&);
 void initializeInstrStatisticPass(llvm::PassRegistry&);
 void initializeHalfPromotionPass(llvm::PassRegistry&);
 void initializeCapLoopIterationsPass(llvm::PassRegistry&);
-void initializeFixFastMathFlagsPass(llvm::PassRegistry&);
 void initializeFCmpPaternMatchPass(llvm::PassRegistry&);
 void initializeCodeAssumptionPass(llvm::PassRegistry&);
 void initializeIGCInstructionCombiningPassPass(llvm::PassRegistry&);

IGC/Compiler/Optimizer/CMakeLists.txt

@@ -18,7 +18,6 @@ add_subdirectory(IGCInstCombiner)
 set(IGC_BUILD__SRC__Optimizer
     "${CMAKE_CURRENT_SOURCE_DIR}/BuiltInFuncImport.cpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/CodeAssumption.cpp"
-    "${CMAKE_CURRENT_SOURCE_DIR}/FixFastMathFlags.cpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/GatingSimilarSamples.cpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/IndirectCallOptimization.cpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/IntDivConstantReduction.cpp"
@@ -45,7 +44,6 @@ set(IGC_BUILD__SRC__Compiler_Optimizer
 set(IGC_BUILD__HDR__Optimizer
     "${CMAKE_CURRENT_SOURCE_DIR}/BuiltInFuncImport.h"
     "${CMAKE_CURRENT_SOURCE_DIR}/CodeAssumption.hpp"
-    "${CMAKE_CURRENT_SOURCE_DIR}/FixFastMathFlags.hpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/GatingSimilarSamples.hpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/IndirectCallOptimization.hpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/IntDivConstantReduction.hpp"