[llvm] [SPIRV] Implement support for SPV_KHR_expect_assume (PR #66217)

[Paulo Matos via llvm-commits]

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@@ -54,6 +54,7 @@ def Enqueue : BuiltinGroup;
 def AsyncCopy : BuiltinGroup;
 def VectorLoadStore : BuiltinGroup;
 def LoadStore : BuiltinGroup;
+def ExpectAssume : BuiltinGroup;
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pmatos wrote:

I thought I needed this but I actually didn't. Removing.

https://github.com/llvm/llvm-project/pull/66217