HInvokeFunction and HApplyArguments instructions now support tail calling.

Inlining of calls at tail position is not supported yet and therefore still disabled.

The tail-call-megatest was modified so that the usages of "arguments" object do not disable Crankshaft.

TBR=bmeurer@chromium.org
BUG=v8:4698
LOG=N

Review URL: https://codereview.chromium.org/1760253003

Cr-Commit-Position: refs/heads/master@{#34542}

In case when F inlined normal call to G which tail calls H we should not write translation for G for the tail call site.
Otherwise we will see G in a stack trace inside H.

This CL also adds a "megatest" which tests product of the following cases:
1) tail caller is inlined/not-inlined
2) tail callee is inlined/not-inlined
3) tail caller has an arguments adaptor frame above or not
4) tail callee has an arguments adaptor frame above or not
5) tail callee is a normal/bound/proxy function

Note that tests for not yet supported cases are not run for now.

BUG=v8:4698
LOG=N

Review URL: https://codereview.chromium.org/1709583002

Cr-Commit-Position: refs/heads/master@{#34108}

Instead of doing a full function body traversal we collect return expressions and mark them after function parsing.

And since we rewrite do-expressions so that the result is explicitly assigned to a result variable the statements marking will never hit so I removed it from the AST.

BUG=v8:4698
LOG=N

Review URL: https://codereview.chromium.org/1693523002

Cr-Commit-Position: refs/heads/master@{#33911}

This CL implements PrepareForTailCall() mentioned in ES6 spec for full codegen, Crankshaft and Turbofan.
When debugger is active tail calls are disabled.

Tail calling can be enabled by --harmony-tailcalls flag.

BUG=v8:4698
LOG=Y
TBR=rossberg@chromium.org

Review URL: https://codereview.chromium.org/1609893003

Cr-Commit-Position: refs/heads/master@{#33509}