codegen: memmove/memset cannot be non-temporal

[RalfJung]

non-temporal memset is not a thing.
And for memmove, since the LLVM backend doesn't support this, surely we don't need it in the GCC backend.

[rustbot]

r? @compiler-errors

rustbot has assigned @compiler-errors.
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Use r? to explicitly pick a reviewer

[rustbot]

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

[compiler-errors]

Thanks, r=me when ci is fixed

[RalfJung]

@bors r=compiler-errors

[bors]

📌 Commit 95582e6 has been approved by compiler-errors

It is now in the queue for this repository.

[bors]

⌛ Testing commit 95582e6 with merge 66f8770...

[bors]

☀️ Test successful - checks-actions
Approved by: compiler-errors
Pushing 66f8770 to master...

[rust-timer]

Finished benchmarking commit (66f8770): 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

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
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.7%	[-3.7%, -3.7%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results

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
Regressions ❌ (secondary)	3.2%	[3.2%, 3.2%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 676.035s -> 674.659s (-0.20%)
Artifact size: 315.80 MiB -> 315.92 MiB (0.04%)