[llvm-cov] Make an API more consistent, NFC

Make renderExpansionView() look a bit more like renderLine(), and
clarify its doxygen comment.

llvm-svn: 273773
diff --git a/llvm/tools/llvm-cov/SourceCoverageViewText.cpp b/llvm/tools/llvm-cov/SourceCoverageViewText.cpp
index c1f281c..e02f4b1 100644
--- a/llvm/tools/llvm-cov/SourceCoverageViewText.cpp
+++ b/llvm/tools/llvm-cov/SourceCoverageViewText.cpp
@@ -158,8 +158,8 @@
 
 unsigned SourceCoverageViewText::renderExpansionView(
     raw_ostream &OS, ExpansionView &ESV, Optional<LineRef> FirstLine,
-    unsigned ExpansionCol, const coverage::CoverageSegment *WrappedSegment,
-    CoverageSegmentArray LineSegments, unsigned ViewDepth) {
+    const coverage::CoverageSegment *WrappedSegment,
+    CoverageSegmentArray Segments, unsigned ExpansionCol, unsigned ViewDepth) {
   unsigned NextExpansionCol = ExpansionCol;
 
   if (FirstLine.hasValue()) {
@@ -168,7 +168,7 @@
     NextExpansionCol = ESV.getStartCol();
     renderLinePrefix(OS, ViewDepth);
     OS.indent(getCombinedColumnWidth(getOptions()) + (ViewDepth == 0 ? 0 : 1));
-    renderLine(OS, *FirstLine, WrappedSegment, LineSegments, ExpansionCol,
+    renderLine(OS, *FirstLine, WrappedSegment, Segments, ExpansionCol,
                ViewDepth);
     renderViewDivider(OS, ViewDepth + 1);
   }