39ebc378c2
Preserve `resolve_obligations_as_possible` temporary allocation across calls
This saves ~20ms in the highlihting bench on my machine
```
284ms - highlight
150ms - infer:wait @ per_query_memory_usage
150ms - infer_query
0 - PerNs::filter_visibility (436 calls)
0 - crate_def_map:wait (336 calls)
2ms - deref_by_trait (909 calls)
0 - generic_params_query (1 calls)
0 - inherent_impls_in_block_query (1 calls)
107ms - resolve_obligations_as_possible (17013 calls)
0 - trait_solve::wait (1017 calls)
0 - PerNs::filter_visibility (13 calls)
17ms - Semantics::analyze_impl (19 calls)
0 - SourceBinder::to_module_def (30 calls)
0 - attrs_query (6 calls)
0 - classify_lifetime (1 calls)
0 - classify_lifetime_ref (4 calls)
35ms - classify_name (28 calls)
54ms - classify_name_ref (452 calls)
0 - crate_def_map:wait (375 calls)
7ms - descend_into_macros (776 calls)
0 - generic_params_query (5 calls)
0 - impl_data_with_diagnostics_query (1 calls)
17ms - infer:wait (32 calls)
0 - resolve_obligations_as_possible (1 calls)
0 - source_file_to_def (1 calls)
0 - trait_solve::wait (1 calls)
```
to
```
256ms - highlight
121ms - infer:wait @ per_query_memory_usage
121ms - infer_query
0 - PerNs::filter_visibility (436 calls)
0 - crate_def_map:wait (336 calls)
2ms - deref_by_trait (909 calls)
0 - generic_params_query (1 calls)
0 - inherent_impls_in_block_query (1 calls)
81ms - resolve_obligations_as_possible (17013 calls)
0 - trait_solve::wait (1017 calls)
0 - PerNs::filter_visibility (13 calls)
17ms - Semantics::analyze_impl (19 calls)
0 - SourceBinder::to_module_def (30 calls)
0 - attrs_query (6 calls)
0 - classify_lifetime (1 calls)
0 - classify_lifetime_ref (4 calls)
35ms - classify_name (28 calls)
56ms - classify_name_ref (452 calls)
0 - crate_def_map:wait (375 calls)
7ms - descend_into_macros (776 calls)
0 - generic_params_query (5 calls)
0 - impl_data_with_diagnostics_query (1 calls)
16ms - infer:wait (32 calls)
0 - resolve_obligations_as_possible (1 calls)
0 - source_file_to_def (1 calls)
0 - trait_solve::wait (1 calls)
```
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| .. | ||
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