[msan] Fix BMI2 detection in msan tests, take 2.

It's not enough if only one bit is present, we need to check that
both are set. This finally fixes the test failures for me.

llvm-svn: 356242

compiler-rt/lib/msan/tests/msan_test.cc

@@ -4650,7 +4650,7 @@ static bool HaveBmi() {
   U4 a = 0, b = 0, c = 0, d = 0;
   asm("cpuid\n\t" : "=a"(a), "=D"(b), "=c"(c), "=d"(d) : "a"(7));
   const U4 kBmi12Mask = (1U<<3) | (1U<<8);
-  return b & kBmi12Mask;
+  return (b & kBmi12Mask) == kBmi12Mask;
 }
 
 __attribute__((target("bmi,bmi2")))