[arm] Distinguish the /U[qytnms]/, 'Uv', 'Q', and 'm' inline assembly memory constraints.

Summary:
But still handle them the same way since I don't know how they differ on
this target.

Of these, /U[qytnms]/ do not have backend tests but are accepted by clang.

No functional change intended.

Reviewers: t.p.northover

Reviewed By: t.p.northover

Subscribers: t.p.northover, aemerson, llvm-commits

Differential Revision: http://reviews.llvm.org/D8203


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238921 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/InlineAsm.h

@@ -248,6 +248,13 @@ public:
     Constraint_R,
     Constraint_S,
     Constraint_T,
+    Constraint_Um,
+    Constraint_Un,
+    Constraint_Uq,
+    Constraint_Us,
+    Constraint_Ut,
+    Constraint_Uv,
+    Constraint_Uy,
     Constraint_X,
     Constraint_Z,
     Constraint_ZC,