ELF: add version script void function test case

[emaste]

Summary

After r280733 we use LLVM's demangler. As a result we no longer have a discrepancy between f() and f(void) on FreeBSD. Restore a test case for a void arg function.

[ruiu]

LGTM

lld/trunk/test/ELF/version-script-extern.s

 # REQUIRES: x86
 
 # RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
 # RUN: echo "LIBSAMPLE_1.0 { \
 # RUN:   global:             \
 # RUN:      extern \"C++\" { \
 # RUN:         \"foo(int)\"; \
 # RUN:         \"zed(int)\"; \
+# RUN:         \"abc::abc()\"; \
 # RUN:   };                  \
 # RUN: };                    \
 # RUN: LIBSAMPLE_2.0 {       \
 # RUN:   global:             \
 # RUN:     extern \"C++\" {  \
 # RUN:       \"bar(int)\";   \
 # RUN:   };                  \
 # RUN: }; " > %t.script

 # DSO-NEXT:      Name: _Z3zedi@@LIBSAMPLE_1.0
 # DSO-NEXT:      Value: 0x1002
 # DSO-NEXT:      Size: 0
 # DSO-NEXT:      Binding: Global (0x1)
 # DSO-NEXT:      Type: Function (0x2)
 # DSO-NEXT:      Other: 0
 # DSO-NEXT:      Section: .text (0x6)
 # DSO-NEXT:    }
+# DSO-NEXT:    Symbol {
+# DSO-NEXT:      Name: _ZN3abcC1Ev@@LIBSAMPLE_1.0
+# DSO-NEXT:      Value: 0x1003
+# DSO-NEXT:      Size: 0
+# DSO-NEXT:      Binding: Global (0x1)
+# DSO-NEXT:      Type: Function (0x2)
+# DSO-NEXT:      Other: 0
+# DSO-NEXT:      Section: .text (0x6)
+# DSO-NEXT:    }
 # DSO-NEXT:  ]
 # DSO-NEXT:  Version symbols {
 # DSO-NEXT:    Section Name: .gnu.version
-# DSO-NEXT:    Address: 0x228
-# DSO-NEXT:    Offset: 0x228
+# DSO-NEXT:    Address: 0x240
+# DSO-NEXT:    Offset: 0x240
 # DSO-NEXT:    Link: 1
 # DSO-NEXT:    Symbols [
 # DSO-NEXT:      Symbol {
 # DSO-NEXT:        Version: 0
 # DSO-NEXT:        Name: @
 # DSO-NEXT:      }
 # DSO-NEXT:      Symbol {
 # DSO-NEXT:        Version: 3
 # DSO-NEXT:        Name: _Z3bari@@LIBSAMPLE_2.0
 # DSO-NEXT:      }
 # DSO-NEXT:      Symbol {
 # DSO-NEXT:        Version: 2
 # DSO-NEXT:        Name: _Z3fooi@@LIBSAMPLE_1.0
 # DSO-NEXT:      }
 # DSO-NEXT:      Symbol {
 # DSO-NEXT:        Version: 2
 # DSO-NEXT:        Name: _Z3zedi@@LIBSAMPLE_1.0
 # DSO-NEXT:      }
+# DSO-NEXT:      Symbol {
+# DSO-NEXT:        Version: 2
+# DSO-NEXT:        Name: _ZN3abcC1Ev@@LIBSAMPLE_1.0
+# DSO-NEXT:      }
 # DSO-NEXT:    ]
 # DSO-NEXT:  }
 
 .text
 .globl _Z3fooi
 .type _Z3fooi,@function
 _Z3fooi:
 retq
 
 .globl _Z3bari
 .type _Z3bari,@function
 _Z3bari:
 retq
 
 .globl _Z3zedi
 .type _Z3zedi,@function
 _Z3zedi:
 retq
+
+.globl _ZN3abcC1Ev
+.type _ZN3abcC1Ev,@function
+_ZN3abcC1Ev:
+retq