[clang] [SystemZ][z/OS] Add text flag when parsing json (PR #211805)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-ssaf

Author: Abhina Sree (abhina-sree)

<details>
<summary>Changes</summary>

This patch adds the text flag when we are opening json files to parse. 

This fixes the following two lit failures on z/OS

```
FAIL: Clang :: Analysis/Scalable/TypeConstrainedPointers/type-constrained-pointers.cpp
FAIL: Clang :: Analysis/Scalable/TypeConstrainedPointers/wpa-result-serialization.test
```

---
Full diff: https://github.com/llvm/llvm-project/pull/211805.diff


1 Files Affected:

- (modified) clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.cpp b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.cpp
index f935761b3c476..b19849233f0f8 100644
--- a/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.cpp
+++ b/clang/lib/ScalableStaticAnalysis/Core/Serialization/JSONFormat/JSONFormatImpl.cpp
@@ -55,7 +55,7 @@ llvm::Expected<Value> readJSON(llvm::StringRef Path) {
         .build();
   }
 
-  auto BufferOrError = llvm::MemoryBuffer::getFile(Path);
+  auto BufferOrError = llvm::MemoryBuffer::getFile(Path, /*IsText=*/true);
   if (!BufferOrError) {
     const std::error_code EC = BufferOrError.getError();
     return ErrorBuilder::create(EC, ErrorMessages::FailedToReadFile, Path,

``````````

</details>


https://github.com/llvm/llvm-project/pull/211805