Use deterministic MapVector for funcAttributeMap

Changed map container from llvm::SmallDenseMap to llvm::MapVector for
storing mappings between llvm::Function* and function attributes.

The map is sequentially read in ZEBinaryBuilder::addFunctionAttrs and
the attributes are added to ZEInfo in that order. The container must
be deterministic to avoid unexpected differences in the ZEBinary.

Author: michalpaszkowski

IGC/Compiler/CISACodeGen/CISABuilder.hpp

@@ -820,7 +820,7 @@ namespace IGC
             unsigned argumentStackSize = 0;
             unsigned allocaStackSize = 0;
         };
-        llvm::SmallDenseMap<llvm::Function*, FuncAttrib> funcAttributeMap;
+        llvm::MapVector<llvm::Function*, FuncAttrib> funcAttributeMap;
 
     public:
         // Used by EmitVISAPass to set function attributes