SWDEV-469825 - Modified the kernel argument readback to use a pointer to volatile

This change modifies the readback mechanism to use a pointer to volatile
instead of a volatile pointer. This ensures that the compiler does not
optimize away the read operation.

Change-Id: I79ff925d615aa8cc4f950e8ff4b7e608fcb179a4


[ROCm/clr commit: ea50d2c0c2]

projects/clr/rocclr/device/rocm/rocvirtual.cpp

@@ -3259,7 +3259,8 @@ bool VirtualGPU::submitKernelInternal(const amd::NDRangeContainer& sizes,
           _mm_sfence();
           *(argBuffer + argSize - 1) = *(parameters + argSize - 1);
           _mm_mfence();
-          auto kSentinel = *reinterpret_cast<volatile address>(argBuffer + argSize - 1);
+          auto kSentinel = *reinterpret_cast<volatile unsigned char*>(
+              argBuffer + argSize - 1);
         }
       }
     }