Add macrobenchmarks

[martinbonnin]

Added benchmark, primarily to see how #5093 behaves.

Using codegen for caching: APK size 987kB

ColdStartupBenchmark_startupNoCompilation
timeToFullDisplayMs   min 290.1,   median 322.8,   max 334.3
timeToInitialDisplayMs   min 200.1,   median 218.6,   max 238.1
Traces: Iteration 0 1 2 3 4 5 6 7 8 9
ColdStartupBenchmark_startupFullCompilation
timeToFullDisplayMs   min 225.5,   median 235.1,   max 265.7
timeToInitialDisplayMs   min 172.8,   median 184.0,   max 216.7
Traces: Iteration 0 1 2 3 4 5 6 7 8 9
ColdStartupBenchmark_startupBaselineProfile
timeToFullDisplayMs   min 308.7,   median 315.5,   max 355.4
timeToInitialDisplayMs   min 196.2,   median 211.3,   max 232.0
Traces: Iteration 0 1 2 3 4 5 6 7 8 9
ColdStartupBenchmark_startupBaselineProfileDisabled
timeToFullDisplayMs   min 208.5,   median 226.4,   max 232.8
timeToInitialDisplayMs   min 165.3,   median 174.1,   max 191.4
Traces: Iteration 0 1 2 3 4 5 6 7 8 9

Using apollo-ast for caching: APK size 984kB

ColdStartupBenchmark_startupNoCompilation
timeToFullDisplayMs   min 321.9,   median 340.9,   max 363.1
timeToInitialDisplayMs   min 207.3,   median 209.7,   max 229.9
Traces: Iteration 0 1 2 3 4 5 6 7 8 9
ColdStartupBenchmark_startupFullCompilation
timeToFullDisplayMs   min 231.4,   median 255.1,   max 276.5
timeToInitialDisplayMs   min 174.9,   median 191.9,   max 212.5
Traces: Iteration 0 1 2 3 4 5 6 7 8 9
ColdStartupBenchmark_startupBaselineProfile
timeToFullDisplayMs   min 325.3,   median 345.9,   max 369.0
timeToInitialDisplayMs   min 201.3,   median 214.6,   max 236.1
Traces: Iteration 0 1 2 3 4 5 6 7 8 9
ColdStartupBenchmark_startupBaselineProfileDisabled
timeToFullDisplayMs   min 215.5,   median 238.6,   max 282.7
timeToInitialDisplayMs   min 160.3,   median 170.8,   max 224.3
Traces: Iteration 0 1 2 3 4 5 6 7 8 9

Ultimately looks like it's still worth generating code to help with the cache, esp. since R8 can remove it all if no cache is used. So I'll probably close #5093 but having the macrobenchmarks is still useful.

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