Add explicit (void) cast to unused unique_ptr::release() results

Summary:
This patch adds explicit `(void)` casts to discarded `release()` calls to suppress -Wunused-result.

This patch fixes *all* warnings are generated as a result of [applying `[[nodiscard]]`  within libc++](https://reviews.llvm.org/D26596).
Similar fixes were applied to Clang in r286796.

Reviewers: chandlerc, dberris

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D26598

llvm-svn: 286797

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Bitcode/Reader/BitReader.cpp b/llvm/lib/Bitcode/Reader/BitReader.cpp
index 63854307b7b..f64785b3ad9 100644
--- a/llvm/lib/Bitcode/Reader/BitReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitReader.cpp
@@ -84,7 +84,9 @@ LLVMBool LLVMGetBitcodeModuleInContext(LLVMContextRef ContextRef,
   std::unique_ptr<MemoryBuffer> Owner(unwrap(MemBuf));
   Expected<std::unique_ptr<Module>> ModuleOrErr =
       getOwningLazyBitcodeModule(std::move(Owner), Ctx);
-  Owner.release();
+  // Release the buffer if we didn't take ownership of it since we never owned
+  // it anyway.
+  (void)Owner.release();
 
   if (Error Err = ModuleOrErr.takeError()) {
     std::string Message;