MemorySanitizer: Correct typo in poison stack pattern command line description

[eyolfson]

Summary

This is just a trivial patch to correct "patter" to "pattern".

[eugenis]

LGTM, thanks!

[eyolfson]

I don't have commit access. I was more submitting this change in order to familarize myself with Phabricator and how the commit process works for LLVM.

[eugenis]

Oh, ok, I can land it for you.

[eugenis]

r249331

lib/Transforms/Instrumentation/MemorySanitizer.cpp

static cl::opt<bool> ClKeepGoing("msan-keep-going",
        cl::Hidden, cl::init(false));
 static cl::opt<bool> ClPoisonStack("msan-poison-stack",
        cl::desc("poison uninitialized stack variables"),
        cl::Hidden, cl::init(true));
 static cl::opt<bool> ClPoisonStackWithCall("msan-poison-stack-with-call",
        cl::desc("poison uninitialized stack variables with a call"),
        cl::Hidden, cl::init(false));
 static cl::opt<int> ClPoisonStackPattern("msan-poison-stack-pattern",
-       cl::desc("poison uninitialized stack variables with the given patter"),
+       cl::desc("poison uninitialized stack variables with the given pattern"),
        cl::Hidden, cl::init(0xff));
 static cl::opt<bool> ClPoisonUndef("msan-poison-undef",
        cl::desc("poison undef temps"),
        cl::Hidden, cl::init(true));
 
 static cl::opt<bool> ClHandleICmp("msan-handle-icmp",
        cl::desc("propagate shadow through ICmpEQ and ICmpNE"),
        cl::Hidden, cl::init(true));