[Infer][Gradle plugin] Fixing issue where files are captured twice

Summary:
When you run "gradle build", it builds both the
debug and the release configurations for an app. This causes capture
to run twice for some files and tricks the incremental analysis into
marking the double-captured files as unchanged. This diff fixes the
issue by only doing capture once on a set of commands that are identical
up to the "debug/release" configuration.

infer/lib/capture/gradle.py

@@ -45,9 +45,17 @@ class GradleCapture:
     def get_inferJ_commands(self, verbose_output):
         argument_start_pattern = ' Compiler arguments: '
         calls = []
+        seen_build_cmds = set([])
         for line in verbose_output:
             if argument_start_pattern in line:
                 content = line.partition(argument_start_pattern)[2].strip()
+                # if we're building both the debug and release configuration
+                # and the build commands are identical up to "release/debug",
+                # only do capture for one set of commands
+                build_agnostic_cmd = content.replace('release', 'debug')
+                if build_agnostic_cmd in seen_build_cmds:
+                    continue
+                seen_build_cmds.add(build_agnostic_cmd)
                 javac_arguments = content.split(' ')
                 java_files = []
                 java_args = []