Misc fix

[chenyan-dfinity]

• Fix merge_init_types and instantiate_candid when the main actor refers to a variable
• Rust codegen: Add pub for struct fields.
• impl CandidType for std::cmp::Reverse
• Candid UI: draw flamegraph for upgrade

[github-actions]

Benchmark for 1d20382

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Test	Base	PR	%
Blob/&str	298.8±158.31µs	257.7±79.76µs	-13.76%
Blob/ByteBuf	226.6±63.69µs	225.2±54.17µs	-0.62%
Blob/Bytes	167.0±87.97µs	161.8±58.99µs	-3.11%
Blob/String	366.2±157.66µs	358.6±164.80µs	-2.08%
Collections/vec (text, nat)	81.5±3.81ms	76.5±4.39ms	-6.13%
Collections/vec int	37.8±1.44ms	34.4±1.51ms	-8.99%
Collections/vec int64	21.2±1.25ms	19.6±1.18ms	-7.55%
Collections/vec nat8	15.9±0.79ms	15.3±0.59ms	-3.77%
option list/1024	1657.5±63.07µs	1592.1±72.98µs	-3.95%
profiles/1024	3.1±0.11ms	3.0±0.13ms	-3.23%
variant list/1024	1293.6±70.17µs	1221.5±61.10µs	-5.57%

[github-actions]

Benchmark for c761db1

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Test	Base	PR	%
Blob/&str	252.0±67.64µs	244.9±69.76µs	-2.82%
Blob/ByteBuf	173.1±42.69µs	172.6±42.31µs	-0.29%
Blob/Bytes	124.2±40.38µs	126.0±41.55µs	+1.45%
Blob/String	327.9±149.51µs	319.4±149.28µs	-2.59%
Collections/vec (text, nat)	72.5±1.14ms	72.8±1.52ms	+0.41%
Collections/vec int	33.2±0.11ms	33.7±0.19ms	+1.51%
Collections/vec int64	19.6±0.32ms	20.3±0.29ms	+3.57%
Collections/vec nat8	14.4±0.05ms	14.5±0.05ms	+0.69%
option list/1024	1376.4±2.19µs	1380.6±3.37µs	+0.31%
profiles/1024	2.7±0.01ms	2.7±0.04ms	0.00%
variant list/1024	1133.5±1.83µs	1139.2±4.37µs	+0.50%

[github-actions]

Benchmark for b225ba9

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Test	Base	PR	%
Blob/&str	237.3±71.05µs	244.8±70.10µs	+3.16%
Blob/ByteBuf	155.3±48.08µs	155.7±47.33µs	+0.26%
Blob/Bytes	114.0±44.30µs	112.4±43.51µs	-1.40%
Blob/String	307.7±150.20µs	316.5±150.34µs	+2.86%
Collections/vec (text, nat)	69.4±0.85ms	69.7±1.12ms	+0.43%
Collections/vec int	32.9±0.17ms	32.4±0.09ms	-1.52%
Collections/vec int64	18.7±0.31ms	19.1±0.30ms	+2.14%
Collections/vec nat8	14.3±0.03ms	14.3±0.03ms	0.00%
option list/1024	1386.1±6.89µs	1384.6±10.43µs	-0.11%
profiles/1024	2.6±0.01ms	2.7±0.00ms	+3.85%
variant list/1024	1130.4±7.58µs	1131.6±6.98µs	+0.11%

[github-actions]

Benchmark for 226d33f

Click to view benchmark

Test	Base	PR	%
Blob/&str	242.6±68.51µs	257.5±68.15µs	+6.14%
Blob/ByteBuf	170.2±42.29µs	167.4±42.84µs	-1.65%
Blob/Bytes	127.4±40.95µs	128.8±42.12µs	+1.10%
Blob/String	325.5±149.37µs	336.5±147.07µs	+3.38%
Collections/vec (text, nat)	71.2±1.11ms	71.9±1.34ms	+0.98%
Collections/vec int	33.0±0.14ms	32.8±0.08ms	-0.61%
Collections/vec int64	19.1±0.25ms	19.1±0.16ms	0.00%
Collections/vec nat8	14.3±0.03ms	14.4±0.03ms	+0.70%
option list/1024	1391.3±29.47µs	1379.7±3.29µs	-0.83%
profiles/1024	2.6±0.01ms	2.7±0.01ms	+3.85%
variant list/1024	1135.4±1.72µs	1125.3±2.32µs	-0.89%