[llvm] [SPIR-V] Add OpSMulExtended and OpUMulExtended builtin support (PR #187474)

[Dmitry Sidorov via llvm-commits]

================
@@ -0,0 +1,112 @@
+; RUN: llc -O0 -mtriple=spirv64-unknown-unknown %s -o - | FileCheck %s --check-prefix=CHECK-SPIRV
----------------
MrSidims wrote:

please add verify machine instructions in both tests

https://github.com/llvm/llvm-project/pull/187474