added section on difference between building with or without prod flag

[stiasta]

My team spent a long time figuring out why our code broke when building our project with the --prod flag compared to when we did not.

Since we don't know much about the build process in angular-cli we did not know what the real difference was when using the flag.

We finally found out that constructor.name did not work when building prod.

Therefore this pull request contains a warning with example and a "difference" section.
I know that tree shaking is done and uglifying. Is there more that could be added?

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.

[googlebot]

CLAs look good, thanks!

[stiasta]

perhaps a lint warning should be added aswell ?

[vfedoriv]

BTW, maybe need add something like this:

-- aot flag is enabled by default with a production build

[filipesilva]

I agree that these differences should be documented, and maybe a new flag to opt-in minification.

We can't add this flag now however, and the documentation shouldn't focus so much on the effects of minification however.

I'll track this in #5315.

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