Removing tcmalloc 1.7
Updating tcmalloc README
Snapshot of REGRESSIONS based on last night's runs
Adding a comma
Minor edits to README.llvm

Defined the acronym SROA, fixed a typo, and added a comma for clarity.
Merge pull request #506 from benharsh/remove-tc-17

Remove tcmalloc version 1.7 and update the README to reflect usage of gperftools-2.2.
Add arrayVectorOps and randomNumbers to primers/Makefile

These two new primers didn't get added to the primers Makefile until now.
Update the name of primer random to randomNumbers in READMEs

The name of this primer changed to avoid a name conflict on case sensitive
filesystems.
Take Mike's suggestion into account.
Merge pull request #509 from bradcray/triage-sep-blc

Snapshot of REGRESSIONS based on last night's runs

Bad:
- memLeaks/promotion failed in --baseline testing

Good:
+ memLeaks/promotion no longer failing in compilation (except in cygwin which lags by several hours)

Business as usual:
* regex cygwin failure back again -- makes sense since re2 was accidentally disabled for a night
* a few other cygwin timeouts have returned; noting them here for now to look at them more before handing off
Merge pull request #508 from daviditen/primersMakefileUpdate

Add arrayVectorOps and randomNumbers to primers/Makefile

We forgot to add these two to the primers/Makefile. Add them. Also, updated the name of random to randomNumbers in two READMEs.
[reviewed by lydia-duncan]
Merge pull request #507 from lydia-duncan/docFreezeLLVM

Minor edits to README.llvm [reviewed by Mike]

Defined the acronym SROA, fixed a typo, and rephrased a paragraph slightly.