[Transforms] Fix i8 alignment in datalayout of lit test

A lit test used overaligned i8, apparently due to an old copy-paste
error, intending to specify i16 alignment.

Change the datalayout string to use naturally aligned i8.

Author: jasilvanus

llvm/test/Transforms/IndVarSimplify/dangling-use.ll

@@ -1,6 +1,6 @@
 ; RUN: opt -passes=indvars -disable-output < %s
 
-target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i8:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f128:64:128-n32"
+target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f128:64:128-n32"
 target triple = "powerpc-unknown-linux-gnu"
 
 define void @vec_inverse_5_7_vert_loop_copyseparate(ptr %x, i32 %n, i32 %rowbytes) nounwind {