[SYCL] Coverity reported issues (intel#10564)

Coverity reported following two issues and fixed with adding a copy
constructor & assignment operator, and removing dead code.

1. Missing user-defined assignment operator - "Copy without assign" rule
violation
2. Uninitialized scalar field - class member variable initialization

---------

Signed-off-by: Kim, Euna <[email protected]>

Author: eunakim0103

sycl/include/sycl/ext/oneapi/sub_group_mask.hpp

@@ -252,6 +252,8 @@ struct sub_group_mask {
   sub_group_mask(const sub_group_mask &rhs)
       : Bits(rhs.Bits), bits_num(rhs.bits_num) {}
 
+  sub_group_mask &operator=(const sub_group_mask &rhs) = delete;
+
   template <typename Group>
   friend std::enable_if_t<std::is_same_v<std::decay_t<Group>, sub_group>,
                           sub_group_mask>

sycl/include/sycl/types.hpp

@@ -751,14 +751,14 @@ template <typename Type, int NumElements> class vec {
   // when root cause of API incompatibility will be fixed
 #ifdef __SYCL_DEVICE_ONLY__
   vec(const vec &Rhs) = default;
+  vec &operator=(const vec &Rhs) = default;
 #else
   constexpr vec(const vec &Rhs) : m_Data(Rhs.m_Data) {}
+  constexpr vec &operator=(const vec &Rhs) = default;
 #endif
 
   vec(vec &&Rhs) = default;
 
-  vec &operator=(const vec &Rhs) = default;
-
   // W/o this, things like "vec<char,*> = vec<signed char, *>" doesn't work.
   template <typename Ty = DataT>
   typename std::enable_if_t<!std::is_same_v<Ty, rel_t> &&

sycl/source/detail/queue_impl.hpp

@@ -842,7 +842,7 @@ class queue_impl {
   // SYCL app are not the same.
   void *MTraceEvent = nullptr;
   /// The stream under which the traces are emitted from the queue object
-  uint8_t MStreamID;
+  uint8_t MStreamID = 0;
   /// The instance ID of the trace event for queue object
   uint64_t MInstanceID = 0;
 

sycl/tools/xpti_helpers/usm_analyzer.hpp

@@ -193,6 +193,7 @@ class USMAnalyzer {
   bool TerminateOnError = false;
 
   USMAnalyzer(const USMAnalyzer &obj) = delete;
+  USMAnalyzer &operator=(const USMAnalyzer &rhs) = delete;
 
   static USMAnalyzer &getInstance() {
     static USMAnalyzer s;