PNaCl: Add NoAlias attributes in ExpandByVal and ExpandVarArgs passes

test/Transforms/NaCl/expand-varargs-attrs.ll

Index: test/Transforms/NaCl/expand-varargs-attrs.ll
diff --git a/test/Transforms/NaCl/expand-varargs-attrs.ll b/test/Transforms/NaCl/expand-varargs-attrs.ll
index f1a41f9df8538cfc600f0f332ed01d39caf130dc..9a8641557620015dea6979e638206af7aa9a7933 100644
--- a/test/Transforms/NaCl/expand-varargs-attrs.ll
+++ b/test/Transforms/NaCl/expand-varargs-attrs.ll
@@ -20,7 +20,7 @@ define void @call_with_arg_attrs(%MyStruct* %s) {
   ret void
 }
 ; CHECK: define void @call_with_arg_attrs(%MyStruct* %s) {
-; CHECK: call void %vararg_func(%MyStruct* byval %s, %vararg_call{{.*}} %vararg_buffer)
+; CHECK: call void %vararg_func(%MyStruct* byval %s, %vararg_call{{.*}} noalias %vararg_buffer)
 
 
 ; The "byval" attribute here should be dropped.
@@ -29,7 +29,7 @@ define i32 @pass_struct_via_vararg1(%MyStruct* %s) {
   ret i32 %result
 }
 ; CHECK: define i32 @pass_struct_via_vararg1(%MyStruct* %s) {
-; CHECK: %result = call i32 %vararg_func(i32 111, %{{.*}}* %vararg_buffer)
+; CHECK: %result = call i32 %vararg_func(i32 111, %{{.*}}* noalias %vararg_buffer)
 
 
 ; The "byval" attribute here should be dropped.
@@ -38,7 +38,7 @@ define i32 @pass_struct_via_vararg2(%MyStruct* %s) {
   ret i32 %result
 }
 ; CHECK: define i32 @pass_struct_via_vararg2(%MyStruct* %s) {
-; CHECK: %result = call i32 %vararg_func(i32 111, %{{.*}}* %vararg_buffer)
+; CHECK: %result = call i32 %vararg_func(i32 111, %{{.*}}* noalias %vararg_buffer)
 
 
 ; Check that return attributes such as "signext" are preserved.