Introduce DIExpression::foldConstantMath()

DIExpressions can get very long and have a lot of redundant operations.
This function uses simple pattern matching to fold constant math that
can be evaluated at compile time.

Author: rastogishubham

llvm/include/llvm/IR/DebugInfoMetadata.h

@@ -3121,6 +3121,11 @@ class DIExpression : public MDNode {
   /// expression and constant on failure.
   std::pair<DIExpression *, const ConstantInt *>
   constantFold(const ConstantInt *CI);
+
+  /// Try to shorten an expression with constant math operations that can be
+  /// evaluated at compile time. Returns a new expression on success, or the old
+  /// expression if there is nothing to be reduced.
+  DIExpression *foldConstantMath();
 };
 
 inline bool operator==(const DIExpression::FragmentInfo &A,

llvm/lib/IR/CMakeLists.txt

@@ -17,6 +17,7 @@ add_llvm_component_library(LLVMCore
   DataLayout.cpp
   DebugInfo.cpp
   DebugInfoMetadata.cpp
+  DIExpressionOptimizer.cpp
   DebugProgramInstruction.cpp
   DebugLoc.cpp
   DiagnosticHandler.cpp