[builtins] Sanitize the machinery around Construct calls.

[builtins] Sanitize the machinery around Construct calls.

There's no point in collecting feedback for super constructor calls,
because in all (interesting) cases we can gather (better) feedback from
other sources (i.e. via inlining or via using a LOAD_IC to get to the
[[Prototype]] of the target).  So CallConstructStub is now only used
for new Foo(...args) sites where we want to collect feedback in the
baseline compiler.  The optimizing compilers, Reflect.construct and
super constructor calls use the Construct builtin directly, which allows
us to remove some weird code from the CallConstructStub (and opens the
possibility for more code sharing with the CallICStub, maybe even going
for a ConstructICStub).

Also remove the 100% redundant HCallNew instruction, which is just a
wrapper for the Construct builtin anyway (indirectly via the
CallConstructStub).

Drive-by-fix: Drop unused has_function_cache bit on Code objects.

R=mstarzinger@chromium.org, yangguo@chromium.org
BUG=v8:4413, v8:4430
LOG=n

Committed: https://crrev.com/374b6ea210f0ce669cdec3bafd4a72dbba5fe2ad
Cr-Commit-Position: refs/heads/master@{#32172}

[Benedikt Meurer, 2015-11-23 09:26:50]

Less code is best code...

Michi: PTAL at compiler
Yang: PTAL at rest

[Benedikt Meurer, 2015-11-23 09:54:29]

The CQ bit was checked by bmeurer@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-23 09:54:41]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1469793002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1469793002/20001

[Michael Starzinger, 2015-11-23 09:54:50]

LGTM on "compiler", didn't look at the rest.

[commit-bot: I haz the power, 2015-11-23 10:14:02]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-23 10:14:02]

Dry run: This issue passed the CQ dry run.

[Yang, 2015-11-23 10:30:58]

On 2015/11/23 10:14:02, commit-bot: I haz the power wrote:
> Dry run: This issue passed the CQ dry run.

lgtm. yay negative line count.

[Benedikt Meurer, 2015-11-23 10:32:07]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-11-23 10:32:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1469793002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1469793002/20001

[commit-bot: I haz the power, 2015-11-23 10:34:09]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-23 10:34:50]

Patchset 2 (id:??) landed as
https://crrev.com/374b6ea210f0ce669cdec3bafd4a72dbba5fe2ad
Cr-Commit-Position: refs/heads/master@{#32172}