[llvm] [SPIR-V] Support all the instructions of SPV_KHR_integer_dot_product (PR #123792)

[Dmitry Sidorov via llvm-commits]

================
@@ -1715,3 +1718,47 @@ class CLMemoryFenceFlags<bits<32> value> {
 def CLK_LOCAL_MEM_FENCE : CLMemoryFenceFlags<0x1>;
 def CLK_GLOBAL_MEM_FENCE : CLMemoryFenceFlags<0x2>;
 def CLK_IMAGE_MEM_FENCE : CLMemoryFenceFlags<0x4>;
+
+//===----------------------------------------------------------------------===//
+// Class defining dot builtins that should be translated into a
+// SPIR-V instruction using the SPV_KHR_integer_dot_product extension.
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MrSidims wrote:

```suggestion
// SPIR-V instruction using SPIR-V 1.6 or the SPV_KHR_integer_dot_product extension.
```

https://github.com/llvm/llvm-project/pull/123792