[llvm] [SSAUpdaterBulk] Fix incorrect live-in values for a block. (PR #131762)

[Valery Pykhtin via llvm-commits]

================
@@ -236,7 +236,7 @@ TEST(SSAUpdaterBulk, SingleBBLoop) {
   Loop->dump();
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vpykhtin wrote:

I've removed gtest-spi.h used for EXPECT_NONFATAL_FAILURE, but SourceMgr.h is used for 

```
SMDiagnostic Err;
std::unique_ptr<llvm::Module> M = llvm::parseAssemblyString(IR, Err, Context);
```

https://github.com/llvm/llvm-project/pull/131762