Remove invalid test. This test requires that dead basic blocks be kept

around. That's not how we do things. Besides, the commit message tells us that
it is covered by the GCC test suite.

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r127497 | zwarich | 2011-03-11 13:51:56 -0800 (Fri, 11 Mar 2011) | 3 lines

Fix the GCC test suite issue exposed by r127477, which was caused by stack
protector insertion not working correctly with unreachable code. Since that
revision was rolled out, this test doesn't actual fail before this fix.
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llvm-svn: 161985