[MSP430] Align functions on 2-byte boundary instead of 4.

Summary:
There is no benefit in having the 4-byte alignment, and removing this
restriction can save a lot of space for some applications.

Reviewers: asl, awygle

Reviewed By: awygle

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D36165

llvm-svn: 313676
diff --git a/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp b/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp
index 55e371f..7cfcb96 100644
--- a/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp
+++ b/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp
@@ -322,7 +322,7 @@
   // TODO: __mspabi_srall, __mspabi_srlll, __mspabi_sllll
 
   setMinFunctionAlignment(1);
-  setPrefFunctionAlignment(2);
+  setPrefFunctionAlignment(1);
 }
 
 SDValue MSP430TargetLowering::LowerOperation(SDValue Op,