Eliminate another debugger stub

Eliminate another debugger stub

This change replaces https://codereview.chromium.org/135213002/

The specialized debugger stub call for static method calls is
no longer needed. It was introduced because once upon a time, the
static method call stub used to patch the call site when the target
was compiled. The VM stopped patching unoptimized static calls a
long time ago. Thus we can treat a static call like a regular runtime
call when patching it to set a breakpoint.

Bonus fix: single step runtime callback on mips was broken. The
enter/leave stub frame were missing.

R=srdjan@google.com

Committed: https://code.google.com/p/dart/source/detail?r=31928

[hausner, 2014-01-17 18:44:14]

This is essentially the same as https://codereview.chromium.org/135213002/ which
you already LGTM'd. I'm abandoning that change since some of the debugger code
has moved to different files since then.

[srdjan, 2014-01-17 18:55:47]

lgtm

[hausner, 2014-01-17 19:09:56]

Committed patchset #1 manually as r31928 (presubmit successful).