[clang] [CIR] Upstream initial support for CIR flattening (PR #130648)

[Erich Keane via cfe-commits]

================
@@ -428,6 +428,46 @@ def ScopeOp : CIR_Op<"scope", [
   ];
 }
 
+//===----------------------------------------------------------------------===//
+// BrOp
+//===----------------------------------------------------------------------===//
+
+def BrOp : CIR_Op<"br",
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erichkeane wrote:

I realize we're shortening 'Branch' to 'Br' because LLVM-IR does, but oof is this an unreadable name.  Is there value here to being terse?

https://github.com/llvm/llvm-project/pull/130648