[Coverage] Fix an issue where improper coverage mapping data could be loaded for an inline function.

If an inline function is observed but unused in a translation unit, dummy
coverage mapping data with zero hash is stored for this function.
If such a coverage mapping section came earlier than real one, the latter
was ignored. As a result, llvm-cov was unable to show coverage information
for those functions.

Differential Revision: http://reviews.llvm.org/D20286

llvm-svn: 270194

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-cov/Inputs/prefer_used_to_unused.cpp b/llvm/test/tools/llvm-cov/Inputs/prefer_used_to_unused.cpp
new file mode 100644
index 00000000000..a0892b1e156
--- /dev/null
+++ b/llvm/test/tools/llvm-cov/Inputs/prefer_used_to_unused.cpp
@@ -0,0 +1,5 @@
+#include "prefer_used_to_unused.h"
+
+int main() {
+  return sampleFunc(5) + simpleFunc(5);
+}