[2019-08] [merp] Put thread into async context before running summarizer

Followup work for #17090

In order to get managed method info for unmanaged stacktraces, we call
`mini_jit_info_table_find_ext` which calls `decode_exception_debug_info` which may
allocate if it's not in async context.

Do the switch in `mono_threads_summarize_execute` so that non-supervising threads
all switch when they run the `sigterm_signal_handler`.  `mono_threads_summarize`
already does it for the supervisor thread.

Fixes #17180



Backport of #17194.

/cc @lambdageek

[merp] Put thread into async context before running summarizer

Followup work for mono#17090

In order to get managed method info for unmanaged stacktraces, we call
`mini_jit_info_table_find_ext` which calls `decode_exception_debug_info` which may
allocate if it's not in async context.

Do the switch in `mono_threads_summarize_execute` so that non-supervising threads
all switch when they run the `sigterm_signal_handler`.  `mono_threads_summarize`
already does it for the supervisor thread.

Fixes mono#17180

Backport of mono#17194.

/cc @lambdageek

[merp] Put thread into async context before running summarizer

Followup work for mono#17090

In order to get managed method info for unmanaged stacktraces, we call
`mini_jit_info_table_find_ext` which calls `decode_exception_debug_info` which may
allocate if it's not in async context.

Do the switch in `mono_threads_summarize_execute` so that non-supervising threads
all switch when they run the `sigterm_signal_handler`.  `mono_threads_summarize`
already does it for the supervisor thread.

Fixes mono#17180

Backport of mono#17194.

/cc @lambdageek

…etry (#17296)

* [merp] Put thread into async context before running summarizer

[merp] Put thread into async context before running summarizer

Followup work for #17090

In order to get managed method info for unmanaged stacktraces, we call
`mini_jit_info_table_find_ext` which calls `decode_exception_debug_info` which may
allocate if it's not in async context.

Do the switch in `mono_threads_summarize_execute` so that non-supervising threads
all switch when they run the `sigterm_signal_handler`.  `mono_threads_summarize`
already does it for the supervisor thread.

Fixes #17180

Backport of #17194.

/cc @lambdageek

* [merp] Don't call install_state_summarizer in EnableMicrosoftTelemetry

install_state_summarizer installs a SIGTERM handler. Unfortunately
sigterm_signal_handler assumes that it will only be called when a crash is
already in progress (it assumes it won't be the supervisor, and so it doesn't
setup the memory for capturing a crash report among other things).

* [merp] Register SIGTERM handler in dump_native_stacktrace

Previously it was installed by EnableMicrosoftTelemetry, which is too early.
Now we get here without a handler installed even when mono_merp_enabled returns true.

…mono#17194)

Followup work for mono/mono#17090

In order to get managed method info for unmanaged stacktraces, we call
mini_jit_info_table_find_ext which calls decode_exception_debug_info which may
allocate if it's not in async context.

Do the switch in mono_threads_summarize_execute so that non-supervising threads
all switch when they run the sigterm_signal_handler.  mono_threads_summarize
already does it for the supervisor thread.

Fixes mono/mono#17180

Commit migrated from mono/mono@cb52186