Greg Clayton d495c5340d Added an allocated memory cache to avoid having to allocate memory over and ...

over when running JITed expressions. The allocated memory cache will cache 
allocate memory a page at a time for each permission combination and divvy up
the memory and hand it out in 16 byte increments. 

llvm-svn: 131453

2011-05-17 03:37:42 +00:00

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