Disable test; what it's testing for is wrong.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82658 91177308-0d34-0410-b5e6-96231b3b80d8

test/FrontendC/2005-07-20-SqrtNoErrno.c

@@ -1,4 +1,7 @@
 // RUN: %llvmgcc %s -S -o - -fno-math-errno | grep llvm.sqrt
+// llvm.sqrt has undefined behavior on negative inputs, so it is
+// inappropriate to translate C/C++ sqrt to this.
+// XFAIL: *
 #include <math.h>
 
 float foo(float X) {