Force context allocation for variables in generator scopes.
* src/scopes.h (ForceContextAllocation, has_forced_context_allocation): New interface to force context allocation for an entire function's scope. * src/scopes.cc: Unless a new scope is a function scope, if its outer scope has forced context allocation, it should also force context allocation. (MustAllocateInContext): Return true if the scope as a whole has forced context allocation. (CollectStackAndContextLocals): Allow temporaries to be context-allocated. * src/parser.cc (ParseFunctionLiteral): Force context allocation for generator scopes. * src/v8globals.h (VariableMode): Update comment on TEMPORARY. * src/arm/full-codegen-arm.cc (Generate): * src/ia32/full-codegen-ia32.cc (Generate): * src/x64/full-codegen-x64.cc (Generate): Assert that generators have no stack slots. * test/mjsunit/harmony/generators-instantiation.js: New test. BUG=v8:2355 TEST=mjsunit/harmony/generators-instantiation Review URL: https://codereview.chromium.org/13408005 Patch from Andy Wingo <wingo@igalia.com>. git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14152 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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