Fix order of size and offset in DW_OP_bit_piece expression

Change-Id: Ib5f45298024a4f58702534335194311a5fa8d87f

Author: pratikashar

IGC/Compiler/DebugInfo/DwarfCompileUnit.cpp

@@ -1702,14 +1702,9 @@ void CompileUnit::buildGeneral(DbgVariable& var, DIE* die, VISAVariableLocation*
 
         if (varInfo.getGRF().subRegNum != 0)
         {
-            enum
-            {
-                REG_SIZE_BITS = 256
-            };
-
             unsigned int subReg = varInfo.getGRF().subRegNum;
             auto offsetInBits = subReg * 8;
-            auto sizeInBits = REG_SIZE_BITS - offsetInBits;
+            auto sizeInBits = (m_pModule->m_pShader->getGRFSize()*8) - offsetInBits;
 
             addUInt(Block, dwarf::DW_FORM_data1, dwarf::DW_OP_bit_piece);
             addUInt(Block, dwarf::DW_FORM_data1, sizeInBits);

IGC/Compiler/DebugInfo/DwarfDebug.cpp

@@ -1402,10 +1402,10 @@ void DwarfDebug::collectVariableInfo(const Function *MF, SmallPtrSet<const MDNod
                                 auto sizeInBits = (m_pModule->m_pShader->getGRFSize()*8) - offsetInBits;
 
                                 write(dotLoc.loc, (uint8_t)llvm::dwarf::DW_OP_bit_piece);
-                                encodeULEB128(offsetInBits, bufLEB128);
-                                write(dotLoc.loc, (unsigned char*)bufLEB128, offsetLEB128Size);
-                                encodeULEB128(sizeInBits, bufLEB128);
+                                sizeLEB128Size = encodeULEB128(sizeInBits, bufLEB128);
                                 write(dotLoc.loc, (unsigned char*)bufLEB128, sizeLEB128Size);
+                                offsetLEB128Size = encodeULEB128(offsetInBits, bufLEB128);
+                                write(dotLoc.loc, (unsigned char*)bufLEB128, offsetLEB128Size);
                             }
                         }
                         else if (varInfo.isSpill())