Revert "Change memcpy/memset/memmove to have dest and source alignments."

This reverts commit r253511.

This likely broke the bots in
http://lab.llvm.org:8011/builders/clang-ppc64-elf-linux2/builds/20202
http://bb.pgr.jp/builders/clang-3stage-i686-linux/builds/3787

llvm-svn: 253543
diff --git a/llvm/test/CodeGen/MSP430/memset.ll b/llvm/test/CodeGen/MSP430/memset.ll
index 68c4f85..76cfb29 100644
--- a/llvm/test/CodeGen/MSP430/memset.ll
+++ b/llvm/test/CodeGen/MSP430/memset.ll
@@ -13,10 +13,10 @@
 ; CHECK-NEXT: mov.w #5, r14
 ; CHECK-NEXT: mov.w #128, r13
 ; CHECK-NEXT: call #memset
-  call void @llvm.memset.p0i8.i16(i8* %0, i8 5, i16 128, i1 false)
+  call void @llvm.memset.p0i8.i16(i8* %0, i8 5, i16 128, i32 1, i1 false)
   ret void
 }
 
 ; Function Attrs: nounwind
-declare void @llvm.memset.p0i8.i16(i8* nocapture, i8, i16, i1) nounwind
+declare void @llvm.memset.p0i8.i16(i8* nocapture, i8, i16, i32, i1) nounwind