[WebGPU] Support equality comparison between SourceSpans

https://bugs.webkit.org/show_bug.cgi?id=241757

Patch by Kiet Ho <tho22@apple.com> on 2022-06-20
Reviewed by Myles C. Maxfield.

* Source/WebGPU/WGSL/SourceSpan.h:
(WGSL::SourceSpan::operator==):

Canonical link: https://commits.webkit.org/251683@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@295678 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebGPU/WGSL/SourceSpan.h

@@ -56,6 +56,14 @@ struct SourceSpan {
         , m_length(end.m_offset - start.m_offset)
     {
     }
+
+    bool operator==(const SourceSpan& other)
+    {
+        return (m_line == other.m_line
+            && m_lineOffset == other.m_lineOffset
+            && m_offset == other.m_offset
+            && m_length == other.m_length);
+    }
 };
 
 }