[diff] run driver prologue and epilogue before diff analysis

Summary:
This was an oversight. The prologue has to be run before capture and analysis
(see eg Infer.run). This sets up a bunch of things that are useful for the
diff analysis as well.

Reviewed By: jeremydubreil

Differential Revision: D5499405

fbshipit-source-id: 8f339cf

infer/src/integration/Diff.ml

@@ -44,6 +44,7 @@ let save_report revision =
   report_name
 
 let diff driver_mode =
+  Driver.run_prologue driver_mode ;
   (* TODO(t15553258) run gen-build script if specified *)
   (* run capture *)
   Driver.capture driver_mode ~changed_files:None ;
@@ -61,5 +62,4 @@ let diff driver_mode =
   checkout Current ;
   let previous_report = Some (save_report Previous) in
   (* compute differential *)
-  ReportDiff.reportdiff ~current_report ~previous_report ; (* TODO(t15553258) report new bugs! *)
-                                                           ()
+  ReportDiff.reportdiff ~current_report ~previous_report ; Driver.run_epilogue driver_mode ; ()

infer/src/integration/Driver.ml

@@ -547,6 +547,7 @@ let run_epilogue driver_mode =
       StatsAggregator.generate_files () ;
       if Config.equal_analyzer Config.analyzer Config.Crashcontext then
         Crashcontext.crashcontext_epilogue ~in_buck_mode ;
-      if Config.fail_on_bug then fail_on_issue_epilogue () ) ;
+      if CLOpt.(equal_command Run) Config.command && Config.fail_on_bug then
+        fail_on_issue_epilogue () ) ;
   if Config.buck_cache_mode then clean_results_dir () ;
   ()

infer/tests/build_systems/diff/Makefile

@@ -52,7 +52,7 @@ test: print
 	$(QUIET)$(call check_no_diff,preexisting.exp,preexisting.exp.test)
 
 .PHONY: replace
-replace: $(EXPECTED_TEST_OUTPUT)
+replace: introduced.exp.test
 	$(COPY) introduced.exp.test introduced.exp
 	$(COPY) fixed.exp.test fixed.exp
 	$(COPY) preexisting.exp.test preexisting.exp