[msl] Add newlines between global declarations

This makes it easier to read modules with many struct and function
declarations.

Bug: 42251016
Change-Id: Idd5a2b48db1e7f19384a0061d276bf723756e780
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/194342
Reviewed-by: dan sinclair <dsinclair@chromium.org>
diff --git a/test/tint/builtins/gen/literal/textureStore/7792fa.wgsl.expected.ir.msl b/test/tint/builtins/gen/literal/textureStore/7792fa.wgsl.expected.ir.msl
index 0764d8a..7374fa3 100644
--- a/test/tint/builtins/gen/literal/textureStore/7792fa.wgsl.expected.ir.msl
+++ b/test/tint/builtins/gen/literal/textureStore/7792fa.wgsl.expected.ir.msl
@@ -1,5 +1,6 @@
 #include <metal_stdlib>
 using namespace metal;
+
 struct tint_module_vars_struct {
   texture3d<int, access::read_write> arg_0;
 };
@@ -8,10 +9,12 @@
   tint_module_vars.arg_0.write(int4(1), uint3(1u));
   tint_module_vars.arg_0.fence();
 }
+
 fragment void fragment_main(texture3d<int, access::read_write> arg_0 [[texture(0)]]) {
   tint_module_vars_struct const tint_module_vars = tint_module_vars_struct{.arg_0=arg_0};
   textureStore_7792fa(tint_module_vars);
 }
+
 kernel void compute_main(texture3d<int, access::read_write> arg_0 [[texture(0)]]) {
   tint_module_vars_struct const tint_module_vars = tint_module_vars_struct{.arg_0=arg_0};
   textureStore_7792fa(tint_module_vars);