Refactoring: HashMap: provide a pointer match function, so users don't need to.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/239133002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20773 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS: Reland "Track field types.".

Port r20746 (09f9176)

Original commit message:
This is an initial step towards tracking the exact types instead of just
the representations of fields. It adds support to track up to one map of
heap object field values, eliminating various map checks on values
loaded from such fields, at the cost of making stores to such fields
slightly more expensive.

Issues with transitioning stores and fast object literals in Crankshaft
fixed.

TEST=mjsunit/field-type-tracking
BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/238943002

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20774 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Revert "Handlifying clients of StringTable, step 1."

This reverts commit r20772.

TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/239273002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20775 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
JumpPatchSites can/should easily deal with uint8 sized offsets.

Motivation is that x64 nosnapshot builds need a 129 byte delta at the moment.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/237673007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20776 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove assertion scopes from V8_Fatal

V8_Fatal no longer tries to print a js stack, so we don't need those
scopes

BUG=none
R=yangguo@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/239293002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20777 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'