Apply suggestions from code review

Author: AndreyPavlenko

lib/gc/Transforms/GPU/GpuTilingAndFusion.cpp

@@ -101,7 +101,7 @@ struct GpuTilingAndFusion final
           auto sizePerThread = numIterations / numThreads * elementSize;
           auto totalSize = std::max(sizePerThread, cachePerThread);
           totalSize = std::max(totalSize / elementSize, 64L);
-          auto xeGpu = canLowerToXeGPU(op);
+          bool xeGpu = canLowerToXeGPU(op);
 
           // If the operation could be lowered to XeGPU, make the tiles
           // multiple of the vector width.

lib/gc/Transforms/GPU/GpuUtils.h

@@ -144,7 +144,7 @@ namespace impl {
 enum class AdjustTilesMode {
   // Sort the input and switch to the First mode.
   Sort,
-  // Adjust the first and call adjustTiles() recursively for the rest.
+  // Adjust the first tile and call adjustTiles() recursively for the rest.
   First,
   // To allow for squeezing, set 1's for all tiles except the last 2.
   XeGpu,