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/DebugInfo/MSF/MSFError.cpp b/llvm/lib/DebugInfo/MSF/MSFError.cpp
index 5272cad..1b8294e 100644
--- a/llvm/lib/DebugInfo/MSF/MSFError.cpp
+++ b/llvm/lib/DebugInfo/MSF/MSFError.cpp
@@ -20,7 +20,7 @@
 // deal with the Error value directly, rather than converting to error_code.
 class MSFErrorCategory : public std::error_category {
 public:
-  const char *name() const LLVM_NOEXCEPT override { return "llvm.msf"; }
+  const char *name() const noexcept override { return "llvm.msf"; }
 
   std::string message(int Condition) const override {
     switch (static_cast<msf_error_code>(Condition)) {