Switch to clang 3.8

Change-Id: I8997bc4d765a18c789f2926da26610178a57be74
diff --git a/cc/cc.go b/cc/cc.go
index d8db52e..42b0f2e 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -139,7 +139,7 @@
 		"-isystem ${SrcDir}/frameworks/base/include",
 	}, " "))
 
-	pctx.StaticVariable("clangPath", "${SrcDir}/prebuilts/clang/${HostPrebuiltTag}/host/3.6/bin/")
+	pctx.StaticVariable("clangPath", "${SrcDir}/prebuilts/clang/host/${HostPrebuiltTag}/3.8/bin/")
 }
 
 type CCModuleContext common.AndroidBaseContext