CodeGen: silence a warning

GCC 4.8.2 objects to the tautological condition in the assert as the unsigned
value is guaranteed to be >= 0.  Simplify the assertion by dropping the
tautological condition.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214671 91177308-0d34-0410-b5e6-96231b3b80d8
X86: silence warning (-Wparentheses)

GCC 4.8.2 points out the ambiguity in evaluation of the assertion condition:

lib/Target/X86/X86FloatingPoint.cpp:949:49: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   assert(STReturns == 0 || isMask_32(STReturns) && N <= 2);

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214672 91177308-0d34-0410-b5e6-96231b3b80d8