[clang] Add option to generate additional debug info for expression dereferencing pointer to pointers. (PR #81545)

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


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``````````bash
git-clang-format --diff 9261ab708e37c2d6499ac063045f816d25a5919c f2c82758e1cba7773e41d941d2812c829c339675 -- clang/lib/CodeGen/CGDebugInfo.cpp clang/lib/CodeGen/CGDebugInfo.h clang/lib/CodeGen/CGDecl.cpp clang/lib/CodeGen/CGExpr.cpp clang/lib/CodeGen/CodeGenFunction.h clang/lib/Driver/ToolChains/Clang.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index b979c0830c..7e38a6946a 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -2074,15 +2074,20 @@ llvm::Value *CodeGenFunction::EmitLoadOfScalar(Address Addr, bool Volatile,
   // Since there is no variable correspond to an intermediate expression, we
   // create a pseudo variable for it and emit its debug info, as if the
   // expression were written in SSA form.
-  if (CGM.getCodeGenOpts().getDebugInfo() > llvm::codegenoptions::DebugLineTablesOnly &&
+  if (CGM.getCodeGenOpts().getDebugInfo() >
+          llvm::codegenoptions::DebugLineTablesOnly &&
       CGM.getCodeGenOpts().DebugInfoForPointerType) {
     if (CGDebugInfo *DI = getDebugInfo())
       // We only generate this debug info if loading from GEP, not from other
       // cases such as loading a function argument.
       if (isa<llvm::GetElementPtrInst>(Load->getOperand(0))) {
         const llvm::DebugLoc &DebugLoc = Load->getDebugLoc();
-        llvm::AllocaInst *PseudoVar = Builder.CreateAlloca(
-            Load->getType(), nullptr, Twine("pseudo_").concat(Twine(DebugLoc.getLine())).concat("_").concat(Twine(DebugLoc.getCol())));
+        llvm::AllocaInst *PseudoVar =
+            Builder.CreateAlloca(Load->getType(), nullptr,
+                                 Twine("pseudo_")
+                                     .concat(Twine(DebugLoc.getLine()))
+                                     .concat("_")
+                                     .concat(Twine(DebugLoc.getCol())));
         DI->EmitPseudoVariable(PseudoVar, Ty, Loc);
         Address PseudoVarAddr(PseudoVar, Load->getType(), Addr.getAlignment());
         Builder.CreateStore(Load, PseudoVarAddr);
@@ -5644,7 +5649,8 @@ LValue CodeGenFunction::EmitBinaryOperatorLValue(const BinaryOperator *E) {
     }
 
     RValue RV = EmitAnyExpr(E->getRHS());
-    if (CGM.getCodeGenOpts().getDebugInfo() > llvm::codegenoptions::DebugLineTablesOnly &&
+    if (CGM.getCodeGenOpts().getDebugInfo() >
+            llvm::codegenoptions::DebugLineTablesOnly &&
         CGM.getCodeGenOpts().DebugInfoForPointerType)
       if (isa<DeclRefExpr>(E->getLHS()) && RV.isScalar())
         RV = RValue::get(UnemitPseudoVariable(RV.getScalarVal()));

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https://github.com/llvm/llvm-project/pull/81545