[compiler-rt] [llvm] [llvm-cov][gcov] Support multi-files coverage in one basic block (PR #144504)

[Fangrui Song via llvm-commits]

================
@@ -271,6 +271,16 @@ class GCOVFunction {
   DenseSet<const GCOVBlock *> visited;
 };
 
+/// GCOVLocation - Represent file of lines same with block_location_info in gcc.
----------------
MaskRay wrote:

Remove `GCOVLocation -` - This is an old comment style which has been phased out

https://github.com/llvm/llvm-project/pull/144504