Remove LLVM_NOEXCEPT and replace it with noexcept

Now that we have dropped MSVC 2013, all supported compilers support
noexcept and we can drop this portability macro.

llvm-svn: 284672
diff --git a/llvm/lib/Object/Error.cpp b/llvm/lib/Object/Error.cpp
index 2357526..c1dfe67 100644
--- a/llvm/lib/Object/Error.cpp
+++ b/llvm/lib/Object/Error.cpp
@@ -24,12 +24,12 @@
 // deal with the Error value directly, rather than converting to error_code.
 class _object_error_category : public std::error_category {
 public:
-  const char* name() const LLVM_NOEXCEPT override;
+  const char* name() const noexcept override;
   std::string message(int ev) const override;
 };
 }
 
-const char *_object_error_category::name() const LLVM_NOEXCEPT {
+const char *_object_error_category::name() const noexcept {
   return "llvm.object";
 }