[PATCH] Add support to FileCheck for out-of-order matching

[Reid Kleckner]

It seems like we have a bunch of tests where we really don't care
about ordering.  Should we add support to FileCheck for that?

For example, this test uses repeated filecheck runs on the temp file
output with different prefixes just to work around this problem:
http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/vtable-layout.cpp?view=markup
I had the same problem while working on vbtable layout.

This is a big grep test that can't easily be filecheck-ified because
there's no out of order matching:
http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenObjC/metadata-symbols-64.m?revision=174461&view=markup
I'd like to filecheck-ify that test because there's something wrong
with the grep escaping on my system.

I propose CHECK-ANYWHERE, or something else with the same behavior.
Basically, this is a check directive that just resets the matching
cursor back the beginning of the file.  Any subsequent checks follow
from the end of a successful match.  Any captured variables are
preserved, mostly because removing them would be hard.

PTAL
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