[llvm] [SandboxIR] Simplify matchers in ShuffleVectorInst unit test (NFC) (PR #105596)

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``````````bash
git-clang-format --diff c557d8520413476221a4f3bf2b7b3fed17681691 c7ab910ab7099416462a64725fc46a11f7b32904 --extensions cpp -- llvm/unittests/SandboxIR/SandboxIRTest.cpp
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View the diff from clang-format here.
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diff --git a/llvm/unittests/SandboxIR/SandboxIRTest.cpp b/llvm/unittests/SandboxIR/SandboxIRTest.cpp
index 93462def39..b6981027b4 100644
--- a/llvm/unittests/SandboxIR/SandboxIRTest.cpp
+++ b/llvm/unittests/SandboxIR/SandboxIRTest.cpp
@@ -836,7 +836,7 @@ define void @foo(<2 x i8> %v1, <2 x i8> %v2) {
     Result.clear();
     sandboxir::ShuffleVectorInst::getShuffleMask(
         SVI->getShuffleMaskForBitcode(), Result);
-    EXPECT_THAT(Result, testing::ElementsAre(0,2));
+    EXPECT_THAT(Result, testing::ElementsAre(0, 2));
   }
 
   // convertShuffleMaskForBitcode

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https://github.com/llvm/llvm-project/pull/105596