[release/8.0] [browser] Remove duplicated marshaling of return value for JSExport #92886
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Backport of #92403 to release/8.0
/cc @maraf
Customer Impact
Duplicated marshalling of return value has extra allocations that may leak and has performance impact
Testing
Manually observed generated code. Automated tests that the generated code works. Automated tests (for checking duplicated return value marshalling) tracked in #92870
Risk
Low
IMPORTANT: If this backport is for a servicing release, please verify that:
The PR target branch is
release/X.0-staging
, notrelease/X.0
.If the change touches code that ships in a NuGet package, you have added the necessary package authoring and gotten it explicitly reviewed.