Add function attribute 'optnone'.

This function attribute indicates that the function is not optimized
by any optimization or code generator passes with the 
exception of interprocedural optimization passes.

llvm-svn: 189101

llvm/lib/Bitcode/Writer/BitcodeWriter.cpp

@@ -205,6 +205,8 @@ static uint64_t getAttrKindEncoding(Attribute::AttrKind Kind) {
     return bitc::ATTR_KIND_NO_UNWIND;
   case Attribute::OptimizeForSize:
     return bitc::ATTR_KIND_OPTIMIZE_FOR_SIZE;
+  case Attribute::OptimizeNone:
+    return bitc::ATTR_KIND_OPTIMIZE_NONE;
   case Attribute::ReadNone:
     return bitc::ATTR_KIND_READ_NONE;
   case Attribute::ReadOnly: