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Port JIT fix to Preview 8: ensure fgFirstBB has appropriate flags #40086

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AndyAyersMS
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Port of #40038 to Preview 8.

Fix #39023

Release jits might sometimes generate bad GC info.

Mysterious intermittent crashes. Without this fix jit GC
info generation for some methods is non-deterministically bad.

Yes, problem does not occur in 3.1.

Very low.

Port of dotnet#40038 to Preview 8.

Fix dotnet#39023

Release jits might sometimes generate bad GC info.

Mysterious intermittent crashes. Without this fix jit GC
info generation for some methods is non-deterministically bad.

Yes, problem does not occur in 3.1.

Very low.
@Dotnet-GitSync-Bot Dotnet-GitSync-Bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Jul 29, 2020
@danmoseley
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was approved

@danmoseley danmoseley merged commit c265c60 into dotnet:release/5.0-preview8 Jul 30, 2020
@ghost ghost locked as resolved and limited conversation to collaborators Dec 8, 2020
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