Update comment and format

Author: jzc

llvm/lib/SYCLLowerIR/SYCLPropagateAspectsUsage.cpp

@@ -657,7 +657,8 @@ void collectVirtualFunctionSetInfo(
 }
 
 // For each set S of virtual functions that F declares,
-// propagate S through the CG and then
+// propagate S through the CG and then add the aspects
+// used by S to F.
 void processDeclaredVirtualFunctionSets(
     Function *F, CallGraphTy &CG, FunctionToAspectsMapTy &AspectsMap,
     SmallPtrSet<const Function *, 16> &Visited,

llvm/test/SYCLLowerIR/PropagateAspectsUsage/virtual-functions-1.ll

@@ -17,4 +17,4 @@ attributes #0 = { "indirectly-callable"="_ZTSv" }
 attributes #1 = { "calls-indirectly"="_ZTSv" }
 
 !sycl_aspects = !{!0}
-!0 = !{!"fp64", i32 6}
+!0 = !{!"fp64", i32 6}

llvm/test/SYCLLowerIR/PropagateAspectsUsage/virtual-functions-2.ll

@@ -33,4 +33,4 @@ attributes #2 = { "calls-indirectly"="setFoo,setBar" }
 
 !sycl_types_that_use_aspects = !{!1, !2}
 !1 = !{!"Foo", i32 1}
-!2 = !{!"Bar", i32 2}
+!2 = !{!"Bar", i32 2}

llvm/test/SYCLLowerIR/PropagateAspectsUsage/virtual-functions-3.ll

@@ -48,4 +48,4 @@ attributes #3 = { "calls-indirectly"="setBar" }
 
 !sycl_types_that_use_aspects = !{!1, !2}
 !1 = !{!"Foo", i32 1}
-!2 = !{!"Bar", i32 2}
+!2 = !{!"Bar", i32 2}