miri subtree update

[RalfJung]

Subtree update of miri to rust-lang/miri@39301e9.

Created using https://github.com/rust-lang/josh-sync.

Out-of-schedule sync to avoid nasty surprises when isolation doesn't work (but also see rust-lang/miri#5025)

r? @ghost

[rustbot]

The Miri subtree was changed

cc @rust-lang/miri

[RalfJung]

@bors r+ p=1

[rust-bors]

📌 Commit b37dbc4 has been approved by RalfJung

It is now in the queue for this repository.

[RalfJung]

@bors rollup

[rust-bors]

💔 Test for c580a7c failed: CI. Failed job:

• Calculate job matrix (web logs, enhanced plaintext logs)

[RalfJung]

@bors retry unable to access 'https://github.com/rust-lang/rust/'

[rust-log-analyzer]

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

[rust-bors]

💔 Test for f96d7de failed: CI. Failed job:

• auto - dist-powerpc-linux (web logs, enhanced plaintext logs)

[RalfJung]

@bors retry Error response from daemon: Get "https://ghcr.io/v2/":

[rust-log-analyzer]

A job failed! Check out the build log: (web)(plain enhanced)(plain)

Click to see the possible cause of the failure (guessed by this bot)

##[endgroup]
Image input checksum 7074714180cfbdae2d3f891c80f9bdbb017c4176e4e5e3f9bdfcb1faaf5d39f5c471ce98f1341e18915fb5087e3490ef5a7fab6e3abf5f4da077a2aa49a69ee9
##[group]Building docker image for dist-powerpc-linux
Docker version 28.0.4, build b8034c0
Error response from daemon: Get "https://ghcr.io/v2/": Get "https://ghcr.io/token?account=rust-lang&client_id=docker&offline_token=true&service=ghcr.io": net/http: request canceled (Client.Timeout exceeded while awaiting headers) (Client.Timeout exceeded while awaiting headers)
##[error]Process completed with exit code 1.
##[group]Run echo "disk usage:"
echo "disk usage:"
df -h
shell: /usr/bin/bash --noprofile --norc -e -o pipefail {0}