Fix left shift operator undefined behavior in integer_ops

Author: joselopeqti

test_conformance/integer_ops/test_extended_bit_ops_insert.cpp

@@ -35,8 +35,11 @@ cpu_bit_insert(T tbase, T tinsert, cl_uint offset, cl_uint count)
     cl_ulong base = static_cast<cl_ulong>(tbase);
     cl_ulong insert = static_cast<cl_ulong>(tinsert);
 
-    cl_ulong mask = (count < 64) ? ((1ULL << count) - 1) << offset : ~0ULL;
-    cl_ulong result = ((insert << offset) & mask) | (base & ~mask);
+    cl_ulong mask = 0;
+    if(offset < 64 )  mask = (count < 64) ? ((1ULL << count) - 1) << offset : ~0ULL;
+    cl_ulong shifted = 0;
+    if(offset < 64 )  shifted = (insert << offset);
+    cl_ulong result = (shifted & mask) | (base & ~mask);
 
     return static_cast<typename std::make_unsigned<T>::type>(result);
 }