[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/extensions/parsing/multiple.wgsl.expected.ir.msl b/test/tint/extensions/parsing/multiple.wgsl.expected.ir.msl
index 8cc32ef..e1ce0da 100644
--- a/test/tint/extensions/parsing/multiple.wgsl.expected.ir.msl
+++ b/test/tint/extensions/parsing/multiple.wgsl.expected.ir.msl
@@ -1,5 +1,6 @@
 #include <metal_stdlib>
 using namespace metal;
+
 struct tint_symbol_outputs {
   float4 tint_symbol_1 [[color(0)]];
 };
@@ -7,6 +8,7 @@
 float4 tint_symbol_inner() {
   return float4(0.10000000149011611938f, 0.20000000298023223877f, 0.30000001192092895508f, 0.40000000596046447754f);
 }
+
 fragment tint_symbol_outputs tint_symbol() {
   return tint_symbol_outputs{.tint_symbol_1=tint_symbol_inner()};
 }