[turbofan] Remove the TryLowerDirectJSCall hack from generic lowering.

[turbofan] Remove the TryLowerDirectJSCall hack from generic lowering.

The TryLowerDirectJSCall method tried to lower to a direct JavaScript
function call depending on the type of the receiver, but only if the
target is a cosntant JSFunction. Since this depends on types and is not
required for correctness, it shouldn't be part of generic lowering
anyway. So this functionality was moved to typed lowering instead, and
we use proper types for the target instead.

R=mstarzinger@chromium.org

Committed: https://crrev.com/6e5b9ffe4c4691570835607a99bc979f0e7cf3fc
Cr-Commit-Position: refs/heads/master@{#29028}

[Benedikt Meurer, 2015-06-15 13:29:16]

Hey Michi,

Some more dehackification; this makes the "direct call" optimization less adhoc,
so that it can apply in more situations. Also it should really be part of typed
lowering, since it's based on types.
Please take a look.

Thanks,
Benedikt

[Michael Starzinger, 2015-06-15 13:38:01]

LGTM. Love it.

[Michael Starzinger, 2015-06-15 13:38:33]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-06-15 13:38:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1182193005/1

[commit-bot: I haz the power, 2015-06-15 14:06:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-15 14:06:25]

Patchset 1 (id:??) landed as
https://crrev.com/6e5b9ffe4c4691570835607a99bc979f0e7cf3fc
Cr-Commit-Position: refs/heads/master@{#29028}