[DebugInfo] Remove dots from getFilenameByIndex return value

When concatenating directory with filename in getFilenameByIndex, we
might end up with a path that contains extra dots. For example, if the
input is /path and ./example, we would return /path/./example. Run
sys::path::remove_dots on the output to eliminate unnecessary dots.

Differential Revision: https://reviews.llvm.org/D87657

Author: petrhosek

llvm/lib/DebugInfo/DWARF/DWARFDebugLine.cpp

@@ -1391,6 +1391,7 @@ bool DWARFDebugLine::Prologue::getFileNameByIndex(
 
   // sys::path::append skips empty strings.
   sys::path::append(FilePath, Style, IncludeDir, FileName);
+  sys::path::remove_dots(FilePath, /*remove_dot_dot=*/true, Style);
   Result = std::string(FilePath.str());
   return true;
 }

llvm/test/tools/llvm-symbolizer/frame-fortran.s

@@ -13,7 +13,7 @@
 
 // CHECK: foo
 // CHECK-NEXT: array
-// CHECK-NEXT: /home/ubuntu{{/|\\}}.{{/|\\}}example.cpp:1
+// CHECK-NEXT: /home/ubuntu{{/|\\}}example.cpp:1
 // CHECK-NEXT: -24 8 ??
 
         .file   "example.cpp"