[Sheriff] Revert "Sync cygwin version with chromium"

This reverts commit r18392 for breaking python compatibility on windows bots.

BUG=
TBR=yangguo@chromium.org

Review URL: https://codereview.chromium.org/110993006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18419 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix a race between concurrent recompilation and OSR.

If concurrent recompilation finishes before OSR, then OSR replaces
the old optimized code without evicting it from the optimized code map.

New functions can get the old optimized code from the optimized code map,
but the old code could be already deoptimized.

BUG=330046
TEST=test/mjsunit/regress-330046.js
LOG=Y
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/109033003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18420 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
ARM: fix loading of global object in LWrapReceiver.

Since r16993 the cp register is handled by registers allocator,
and we cannot assume that the cp always contains the context.

BUG=318420
LOG=Y
TEST=test/mjsunit/regress/regress-318420.js
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/121703002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18421 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'