Change the .ll syntax for comdats and add a syntactic sugar.

In order to make comdats always explicit in the IR, we decided to make
the syntax a bit more compact for the case of a GlobalObject in a
comdat with the same name.

Just dropping the $name causes problems for

@foo = globabl i32 0, comdat
$bar = comdat ...

and

declare void @foo() comdat
$bar = comdat ...

So the syntax is changed to

@g1 = globabl i32 0, comdat($c1)
@g2 = globabl i32 0, comdat

and

declare void @foo() comdat($c1)
declare void @foo() comdat

llvm-svn: 225302
diff --git a/llvm/test/CodeGen/X86/coff-comdat2.ll b/llvm/test/CodeGen/X86/coff-comdat2.ll
index 58bc04e..a417d09 100644
--- a/llvm/test/CodeGen/X86/coff-comdat2.ll
+++ b/llvm/test/CodeGen/X86/coff-comdat2.ll
@@ -5,5 +5,5 @@
 
 $foo = comdat largest
 @foo = global i32 0
-@bar = global i32 0, comdat $foo
+@bar = global i32 0, comdat($foo)
 ; CHECK: Associative COMDAT symbol 'foo' is not a key for its COMDAT.