[llvm-reduce][DebugInfo] Support reducing non-instruction debug-info

[jmorse]

LLVM will shortly be able to represent variable locations without encoding information into intrinsics -- they'll be stored as DPValue objects instead. We'll still need to be able to llvm-reduce these variable location assignments just like we can with intrinsics today, thus, here's an llvm-reduce pass that enumerates and reduces the DPValue objects.

The test for this is paradoxically written with dbg.value intrinsics: this is because we're changing all the core parts of LLVM to support this first, with the textual IR format coming last. Until that arrives, testing the llvm-reduce'ing of DPValues needs the added test using intrinsics. We should be able to drop the variable assignment using %alsoloaded using this method. As with the other llvm-reduce tests, I've got one set of check lines for making the reduction happen as desired, and the other set to check the final output.

[github-actions]

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

You can test this locally with the following command:

git-clang-format --diff 535b197b8e96b816998ad4b4ee45e011fa05fba9 443b957ec353d4c238157d4ca13fd63ad064ce9e -- llvm/tools/llvm-reduce/deltas/ReduceDPValues.cpp llvm/tools/llvm-reduce/deltas/ReduceDPValues.h llvm/tools/llvm-reduce/DeltaManager.cpp llvm/tools/llvm-reduce/llvm-reduce.cpp

View the diff from clang-format here.

diff --git a/llvm/tools/llvm-reduce/DeltaManager.cpp b/llvm/tools/llvm-reduce/DeltaManager.cpp
index 56e39b8f93..bcbcbea891 100644
--- a/llvm/tools/llvm-reduce/DeltaManager.cpp
+++ b/llvm/tools/llvm-reduce/DeltaManager.cpp
@@ -112,7 +112,7 @@ static cl::list<std::string>
     DELTA_PASS("atomic-ordering", reduceAtomicOrderingDeltaPass)               \
     DELTA_PASS("syncscopes", reduceAtomicSyncScopesDeltaPass)                  \
     DELTA_PASS("instruction-flags", reduceInstructionFlagsDeltaPass)           \
-} while (false)
+  } while (false)
 
 #define DELTA_PASSES_MIR                                                       \
   do {                                                                         \

[OCHyams]

LGTM