fix trivial typos in comments; NFC

llvm-svn: 307094
diff --git a/llvm/lib/Target/ARM/ARMCallLowering.cpp b/llvm/lib/Target/ARM/ARMCallLowering.cpp
index e498f70..051827a 100644
--- a/llvm/lib/Target/ARM/ARMCallLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMCallLowering.cpp
@@ -321,7 +321,7 @@
     assert(VA.getValVT().getSizeInBits() <= 64 && "Unsupported value size");
     assert(VA.getLocVT().getSizeInBits() <= 64 && "Unsupported location size");
 
-    // The necesary extensions are handled on the other side of the ABI
+    // The necessary extensions are handled on the other side of the ABI
     // boundary.
     markPhysRegUsed(PhysReg);
     MIRBuilder.buildCopy(ValVReg, PhysReg);