Fix typos found by http://github.com/lyda/misspell-check

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157885 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FloatingPoint.cpp b/lib/Target/X86/X86FloatingPoint.cpp
index ed1707d..711ee41 100644
--- a/lib/Target/X86/X86FloatingPoint.cpp
+++ b/lib/Target/X86/X86FloatingPoint.cpp
@@ -130,7 +130,7 @@
     // The hardware keeps track of how many FP registers are live, so we have
     // to model that exactly. Usually, each live register corresponds to an
     // FP<n> register, but when dealing with calls, returns, and inline
-    // assembly, it is sometimes neccesary to have live scratch registers.
+    // assembly, it is sometimes necessary to have live scratch registers.
     unsigned Stack[8];          // FP<n> Registers in each stack slot...
     unsigned StackTop;          // The current top of the FP stack.