[Autobackout][FuncReg]Revert of change: 619e0f7

 Fixed insertelement indirect addressing

When handling emitInsert() function with simd32 enabled, generated code
was filling address register with values from uninitialized part of
other grf register.

This issue was happening when insertelement intruction used runtime indirect
addressing and passed arguements were not uniform. Previously sub region
for second loop iteriation that generated addr_add instruction was
always set to 16, which was incorrect when variable datatype inside
vector was 64 bit. It caused filling the same grf register twice instead
of filling the next one. Changing sub region to 0 instead of 16 when datatype is 64
bit fixes this issue.

Author: MiloszSkobejko

IGC/Compiler/CISACodeGen/EmitVISAPass.cpp

@@ -12243,10 +12243,9 @@ void EmitPass::emitInsert(llvm::Instruction* inst)
                 CVariable* dst = m_destination;
                 if (i == 1)
                 {
-                    IGC_ASSERT_MESSAGE(getGRFSize() == 64, "This code should execute for 64 byte GRF register size device");
                     // explicitly set second half as we are manually splitting
                     m_encoder->SetSecondHalf(true);
-                    m_encoder->SetSrcSubReg(1, vecTypeSize == 8 ? 0 : 16);
+                    m_encoder->SetSrcSubReg(1, 16);
                     dst = m_currShader->GetNewAlias(dst, dst->GetType(), 16 * dst->GetElemSize(), 0);
                 }
                 CVariable* pDstArrElm = m_currShader->GetNewAddressVariable(