TBR: i#1732 drcpusim: add cpuid fooling

Commit log for first patchset:
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i#1732 drcpusim: add cpuid fooling

Adds cpuid fooling for all of the Intel models supported by drcpusim, under
an on-by-default option -fool_cpuid.  Only the feature queries (along with
max values and brands reporting alongside) are fooled: all other cpuid
queries are unchanged.  The cpuid information for each model is stored in a
struct in the code.

Adds tests to the suite for cpuid fooling for Klamath through Ivybridge.
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[bruening, 2015-08-06 00:41:07]

Committed as
https://github.com/DynamoRIO/dynamorio/commit/86ed8853f158828b9588dbdbf9b3ca7...

Final commit log: 
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i#1732 drcpusim: add cpuid fooling

Adds cpuid fooling for all of the Intel models supported by drcpusim, under
an on-by-default option -fool_cpuid.  Only the feature queries (along with
max values and brands reporting alongside) are fooled: all other cpuid
queries are unchanged.  The cpuid information for each model is stored in a
struct in the code.

Adds tests to the suite for cpuid fooling for Klamath through Ivybridge.

Review-URL: https://codereview.appspot.com/258130043
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