Fix presubmit style warning for gdb-jit.cc

For many moons now I've been seeing this warning when running make x64.release.check:

  /home/wingo/src/v8/src/gdb-jit.cc:632:
     Single-argument constructors should be marked explicit.
     [runtime/explicit] [5]

This patch fixes it.

BUG=

Review URL: https://codereview.chromium.org/13724006
Patch from Andy Wingo <wingo@igalia.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14153 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix Array.prototype.concat when exceeding array size limit.

R=verwaest@chromium.org
BUG=v8:581

Review URL: https://chromiumcodereview.appspot.com/13465008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14154 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove unnecessary explicity prototype check.

The prototype is implicitly checked through a map check of the holder.
This is either checked in CheckPrototypes, or as part of the IC.

Review URL: https://chromiumcodereview.appspot.com/13529017

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14155 ce2b1a6d-e550-0410-aec6-3dcde31c8c00