Enable stack smashing protection

[jumde]

1. Automatic reference counting (-fobjc-arc) helps to prevent use-after-free and use-after-release bugs.

2. Stack smashing protection (-fstack-protector-all) helps to prevent stack buffer overflows.

[garrettr]

We're already using -fstack-protector-strong for debug builds on macOS, probably worth auditing to make sure we're also using it in release builds and for all supported platforms.

[jumde]

Ignore Automatic reference counting.

[bbondy]

Do you know the perf implication of turning these on @jumde ?
Based on What Garrett mentioned on Jul 12, do you know what's actually happening today?

[jumde]

@bbondy

Looks like its enabled for the Helper processes but not the main binary

$ otool -I -v "Brave Browser Beta Helper" | grep stack
0x000000010000ee1c    29 ___stack_chk_fail
0x0000000100010008    30 ___stack_chk_guard
0x0000000100010100    29 ___stack_chk_fail

$ otool -I -v "Brave Browser Beta" | grep stack

[jumde]

Behavior is same in chrome.