[hwasan] Default -hwasan-use-stack-safety to off.

[fmayer]

Summary

This very occasionally causes to an assertion failure in the compiler.
Turning off until we can get to the bottom of this.

llvm/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp

ClRecover("hwasan-recover",
               cl::desc("Enable recovery mode (continue-after-error)."),
               cl::Hidden, cl::init(false));
 
 static cl::opt<bool> ClInstrumentStack("hwasan-instrument-stack",
                                        cl::desc("instrument stack (allocas)"),
                                        cl::Hidden, cl::init(true));
 
 static cl::opt<bool>
-    ClUseStackSafety("hwasan-use-stack-safety", cl::Hidden, cl::init(true),
+    ClUseStackSafety("hwasan-use-stack-safety", cl::Hidden, cl::init(false),
                      cl::Hidden, cl::desc("Use Stack Safety analysis results"),
                      cl::Optional);
 
 static cl::opt<bool>
     ClUseAfterScope("hwasan-use-after-scope",
                     cl::desc("detect use after scope within function"),
                     cl::Hidden, cl::init(false));