Fix a small bug in the parsing of anonymous globals.

It was able to parse

hidden dllexport global i32 42

but not

dllexport global i32 42

llvm-svn: 210121

llvm/lib/AsmParser/LLParser.cpp

@@ -261,6 +261,8 @@ bool LLParser::ParseTopLevelEntities() {
     case lltok::kw_default:             // OptionalVisibility
     case lltok::kw_hidden:              // OptionalVisibility
     case lltok::kw_protected:           // OptionalVisibility
+    case lltok::kw_dllimport:           // OptionalDLLStorageClass
+    case lltok::kw_dllexport:           // OptionalDLLStorageClass
     case lltok::kw_thread_local:        // OptionalThreadLocal
     case lltok::kw_addrspace:           // OptionalAddrSpace
     case lltok::kw_constant:            // GlobalType

llvm/test/Feature/globalvars.ll

@@ -16,3 +16,5 @@ define i32 @foo(i32 %blah) {
         ret i32 %blah
 }
 
+hidden dllexport global i32 42
+dllexport global i32 42