Normalize hex addresses in zjit_diff stat keys

Strip memory addresses (0x...) from stat keys so entries that differ
only by object address (e.g. "#<Module:0x00007f1a>#foo") are collapsed
and their values summed for comparison.

$ jq . data/output_272.json | grep -E Module.+object_id
          "not_inlined_cfuncs_#<Module:0x000000012a3521c0>#object_id": 26,
          "not_annotated_cfuncs_#<Module:0x000000012a3521c0>#object_id": 26,
          "ccall_#<Module:0x000000012a3521c0>#object_id": 26,
          "not_inlined_cfuncs_#<Module:0x000000010ff26240>#object_id": 25,
          "not_annotated_cfuncs_#<Module:0x000000010ff26240>#object_id": 25,
          "ccall_#<Module:0x000000010ff26240>#object_id": 25,

$ misc/zjit_diff.rb data/output_272.json -a | grep -E Module.+object_id
    #<Module:0x…>#object_id                           26 →             25 ▼   -3.8%
    #<Module:0x…>#object_id                           26 →             25 ▼   -3.8%
    #<Module:0x…>#object_id                           26 →             25 ▼   -3.8%

Author: rwstauner

misc/zjit_diff.rb

@@ -84,6 +84,7 @@ def initialize(path, threshold_pct: DEFAULT_THRESHOLD_PCT, minimum_diff: DEFAULT
     @minimum_diff = minimum_diff
     @limit = limit
     @benchmark_filter = benchmarks
+    normalize_zjit_stats!
   end
 
   def run
@@ -396,6 +397,28 @@ def format_bytes(bytes)
       "#{bytes}B"
     end
   end
+
+  # Strip hex addresses from stat keys so that entries like
+  # "#<Module:0x00007f1a>#foo" and "#<Module:0x00007f2b>#foo"
+  # collapse into one. Numeric values are summed when keys merge.
+  def normalize_zjit_stats!
+    @raw_data.each_value do |benchmarks|
+      benchmarks.each_value do |bench_data|
+        next unless bench_data.is_a?(Hash) && bench_data['zjit_stats'].is_a?(Hash)
+        stats = bench_data['zjit_stats']
+        normalized = {}
+        stats.each do |key, value|
+          nkey = key.gsub(/0x\h+/, '0x…')
+          if normalized.key?(nkey) && value.is_a?(Numeric) && normalized[nkey].is_a?(Numeric)
+            normalized[nkey] += value
+          else
+            normalized[nkey] = value
+          end
+        end
+        bench_data['zjit_stats'] = normalized
+      end
+    end
+  end
 end
 
 if __FILE__ == $0