Fix bug in llvm::sys::argumentsFitWithinSystemLimits().
Fix bug in llvm::sys::argumentsFitWithinSystemLimits().

This patch fixes a subtle bug in the UNIX implementation of
llvm::sys::argumentsFitWithinSystemLimits() regarding the misuse of a static
variable. This bug causes our cached number that stores the system command line
maximum length to be halved after each call to the function. With a sufficient
number of calls to this function, it will eventually report any given command
line string to be over system limits.

Patch by Rafael Auler.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@216415 91177308-0d34-0410-b5e6-96231b3b80d8

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