Bump backtrace to rust-lang/backtrace-rs@4d7906b

[workingjubilee]

Compare: rust-lang/backtrace-rs@230570f...4d7906b

Mostly cleanups and enabling backtraces for the RTEMS target.

r? @ghost

[workingjubilee]

@bors r+ p=1

[bors]

📌 Commit 6f5fd6d has been approved by workingjubilee

It is now in the queue for this repository.

[bors]

⌛ Testing commit 6f5fd6d with merge 870c13d...

[bors]

☀️ Test successful - checks-actions
Approved by: workingjubilee
Pushing 870c13d to master...

[rust-timer]

Finished benchmarking commit (870c13d): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (primary 1.1%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	3.6%	[3.6%, 3.6%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-1.4%	[-1.4%, -1.4%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	1.1%	[-1.4%, 3.6%]	2

Cycles

Results (primary 2.8%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	2.8%	[2.8%, 2.8%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.8%	[2.8%, 2.8%]	1

Binary size

Results (primary 0.1%, secondary 0.1%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	0.1%	[0.0%, 0.1%]	12
Regressions ❌ (secondary)	0.1%	[0.1%, 0.3%]	38
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.1%	[0.0%, 0.1%]	12

Bootstrap: 763.678s -> 763.847s (0.02%)
Artifact size: 325.50 MiB -> 325.57 MiB (0.02%)