Add support for embedded metadata to LLVM. This introduces two new types of

Constant, MDString and MDNode which can only be used by globals with a name
that starts with "llvm." or as arguments to a function with the same naming
restriction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68420 91177308-0d34-0410-b5e6-96231b3b80d8

test/Feature/embeddedmetadata.ll

@@ -0,0 +1,11 @@
+; RUN: llvm-as < %s | llvm-dis | not grep undef
+
+declare i8 @llvm.something({ } %a)
+
+@llvm.foo = internal constant { } !{i17 123, { } !"foobar"}
+
+define void @foo() {
+  %x = call i8 @llvm.something({ } !{{ } !"f\00oa", i42 123})
+  ret void
+}
+