[llvm] [WIP] Extend data layout to add non zero null value for address space. (PR #83109)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff 3356818eed3224c50012f8ed2bfa046f2bc8e154 540b9e8a21e883016aba3398cbbb8aabfefe06cb -- llvm/include/llvm/IR/DataLayout.h llvm/lib/IR/DataLayout.cpp
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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/IR/DataLayout.h b/llvm/include/llvm/IR/DataLayout.h
index 75fd19efd7..7e41653718 100644
--- a/llvm/include/llvm/IR/DataLayout.h
+++ b/llvm/include/llvm/IR/DataLayout.h
@@ -21,10 +21,10 @@
 
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringRef.h"
-#include "llvm/ADT/DenseMap.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/Type.h"
 #include "llvm/Support/Alignment.h"
@@ -303,10 +303,10 @@ public:
   }
 
   uint64_t getNonZeroValueForAddrSpace(uint64_t AddrSpace) {
-  auto It = AddrSpaceToNonZeroValueMap.find(AddrSpace);
-  if (It == AddrSpaceToNonZeroValueMap.end())
-    return 0x000000000;
-  return AddrSpaceToNonZeroValueMap[AddrSpace];
+    auto It = AddrSpaceToNonZeroValueMap.find(AddrSpace);
+    if (It == AddrSpaceToNonZeroValueMap.end())
+      return 0x000000000;
+    return AddrSpaceToNonZeroValueMap[AddrSpace];
   }
 
   void setNonZeroValueForAddrSpace(uint64_t AddrSpace, uint64_t Value) {
diff --git a/llvm/lib/IR/DataLayout.cpp b/llvm/lib/IR/DataLayout.cpp
index 591b0fda66..83d0debdcc 100644
--- a/llvm/lib/IR/DataLayout.cpp
+++ b/llvm/lib/IR/DataLayout.cpp
@@ -511,14 +511,14 @@ Error DataLayout::parseSpecifier(StringRef Desc) {
         return reportError("Invalid address space, must be a 24-bit integer");
 
       if (Rest.empty())
-        return reportError(
-            "Missing address space specification for pointer in datalayout string");
+        return reportError("Missing address space specification for pointer in "
+                           "datalayout string");
       if (Error Err = ::split(Rest, ':', Split))
         return Err;
       uint64_t Value;
       if (Error Err = getInt(Tok, Value))
         return Err;
-      
+
       setNonZeroValueForAddrSpace(AddrSpace, Value);
 
       break;

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https://github.com/llvm/llvm-project/pull/83109