PPC: [builtins] Remove the weird STACK_OVERFLOW builtin.

PPC: [builtins] Remove the weird STACK_OVERFLOW builtin.

Port 39604dda567b9ba9f4dcfe42f95471f30ec7cb6b

Original commit message:
    Just use a %ThrowStackOverflow runtime function instead, which
    does the trick, especially since the Isolate already has a
    preallocated StackOverflow error for that.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1334303002

Cr-Commit-Position: refs/heads/master@{#30697}