[PATCH] [libcxx] Add numerous options to libc++ LIT test suite configuration.

[Dan Albert]

LGTM with the one doc change.


================
Comment at: www/lit_usage.html:127
@@ +126,3 @@
+<blockquote class="lit-option-desc">
+Specify additional compile flags as a string.
+Note: This options should not be used to change the standard version used.
----------------
I had meant explicitly state that it is space delimited.

http://reviews.llvm.org/D5877

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