Change windows CI to use the same bytecode directory as linux.

appveyor.yml

@@ -65,7 +65,8 @@ build_script:
     - msbuild solidity.sln /p:Configuration=%CONFIGURATION% /m:%NUMBER_OF_PROCESSORS% /v:minimal
     - cd %APPVEYOR_BUILD_FOLDER%
     - scripts\release.bat %CONFIGURATION%
-    - scripts\bytecodecompare\storebytecode.bat %CONFIGURATION% %APPVEYOR_REPO_COMMIT%
+    - ps: $bytecodedir = git show -s --format="%cd-%H" --date=short
+    - ps: scripts\bytecodecompare\storebytecode.bat $Env:CONFIGURATION $bytecodedir
 
 test_script:
     - cd %APPVEYOR_BUILD_FOLDER%

scripts/bytecodecompare/storebytecode.bat

@@ -20,7 +20,7 @@ REM Copyright (c) 2017 solidity contributors.
 REM ---------------------------------------------------------------------------
 
 set CONFIGURATION=%1
-set COMMIT=%2
+set DIRECTORY=%2
 
 mkdir bytecode
 cd bytecode
@@ -33,8 +33,8 @@ git config user.name "travis"
 git config user.email "chris@ethereum.org"
 git clean -f -d -x
 
-mkdir %COMMIT%
-set REPORT=%COMMIT%/windows.txt
+if not exist %DIRECTORY% mkdir %DIRECTORY%
+set REPORT=%DIRECTORY%/windows.txt
 cp ../report.txt %REPORT%
 git add %REPORT%
 git commit -a -m "Added report."