[WebAssembly] Merge commit 412a3381f721452fb6cd33bc30e7700102639e3f into the 12.0 branch

[dragonroot]

Bugzilla Link	50424
Resolution	FIXED
Resolved on	Jun 08, 2021 15:57
Version	unspecified
OS	Linux
Depends On	#49701
Blocks	#48661
CC	@aheejin,@dschuff,@tstellar
Fixed by commit(s)	412a338 6a86669

Extended Description

Hi,
I'd like to request backporting this commit into 12.0.1. It's a self-contained fix for a bug found in 12.0.0 (see bug 50357).

[dragonroot]

assigned to @sunfishcode

[tstellar]

Hi Dan,

What is your opinion on backporting this?

https://reviews.llvm.org/rG412a3381f721452fb6cd33bc30e7700102639e3f

[dragonroot]

FWIW, I've been running with this fix since it has been made, and the code produced for exception specifications has been working correctly now (unlike before the fix). Tested with -O0, -O3, and with and without -flto. The fix doesn't affect code generation when no exception specifications are present, since it doesn't change the compiler behavior in that case.

[sunfishcode]

Looks good to me!

[tstellar]

Merged: 6a86669