[scan-build-py] Patch to fix "-analyzer-config" option

[haowei]

Summary

I noticed that when I use "-analyze-config" option in scan-build-py, it behaves differently from original perl based scan-build.

For example, command:

$ scan-build -analyzer-config ipa=basic-inlining make

Will work without any issues on perl version of scan-build. But on scan-build-py it will throw an error message "error reading 'ipa=basic-inlining'".
After debugging, it turns out that the scan-build-py does not put "-analyzer-config" flag in front of the analyzer config flags (in this case is the "ipa=basic-inlining") in the final clang command line. This patch fixes this issue.

[phosek]

LGTM

cfe/trunk/tools/scan-build-py/libscanbuild/analyze.py

if args.analyze_headers:
         result.append('-analyzer-opt-analyze-headers')
     if args.stats:
         result.append('-analyzer-checker=debug.Stats')
     if args.maxloop:
         result.extend(['-analyzer-max-loop', str(args.maxloop)])
     if args.output_format:
         result.append('-analyzer-output={0}'.format(args.output_format))
     if args.analyzer_config:
-        result.append(args.analyzer_config)
+        result.extend(['-analyzer-config', args.analyzer_config])
     if args.verbose >= 4:
         result.append('-analyzer-display-progress')
     if args.plugins:
         result.extend(prefix_with('-load', args.plugins))
     if args.enable_checker:
         checkers = ','.join(args.enable_checker)
         result.extend(['-analyzer-checker', checkers])
     if args.disable_checker: