Improve the allocation and initialization of locals on IA32 in the top-level ...

Improve the allocation and initialization of locals on IA32 in the top-level compiler.

This optimization is already done on x64 and ARM. 

Until now we used a push immediate for each local variable on IA32:

  push $undefined
  push $undefined
  ...

to initialize each local variable. This change does:

  mov eax, $undefined
  push eax
  push eax
  ...




Committed: http://code.google.com/p/v8/source/detail?r=3304

[fschneider, 2009-11-13 12:12:11]

This optimization was missing on IA32.

[William Hesse, 2009-11-13 12:13:39]

LGTM.