Compare all fields in SkSL::Layout::operator==

Change-Id: I344bf5ddee4242f17325377a664ddb17b26e6f31
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285789
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>

src/sksl/ir/SkSLLayout.h

@@ -402,7 +402,10 @@ struct Layout {
                fFormat               == other.fFormat &&
                fPrimitive            == other.fPrimitive &&
                fMaxVertices          == other.fMaxVertices &&
-               fInvocations          == other.fInvocations;
+               fInvocations          == other.fInvocations &&
+               fWhen                 == other.fWhen &&
+               fKey                  == other.fKey &&
+               fCType                == other.fCType;
     }
 
     bool operator!=(const Layout& other) const {