Fix a typo 'iff' => 'if'

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164767 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FloatingPoint.cpp b/lib/Target/X86/X86FloatingPoint.cpp
index 791f598..2d027dd 100644
--- a/lib/Target/X86/X86FloatingPoint.cpp
+++ b/lib/Target/X86/X86FloatingPoint.cpp
@@ -1280,7 +1280,7 @@
 }
 
 /// handleCondMovFP - Handle two address conditional move instructions.  These
-/// instructions move a st(i) register to st(0) iff a condition is true.  These
+/// instructions move a st(i) register to st(0) if a condition is true.  These
 /// instructions require that the first operand is at the top of the stack, but
 /// otherwise don't modify the stack at all.
 void FPS::handleCondMovFP(MachineBasicBlock::iterator &I) {