cmd/compile: determine static values of len and cap in make() calls

[mateusz834]

This change improves escape analysis by attempting to
deduce static values for the len and cap parameters,
allowing allocations to be made on the stack.

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Patch Set 1:

This CL has failed the run. Reason:

Tryjob golang/try/gotip-linux-amd64-boringcrypto has failed with summary (view all results):

---

• go on master (change 649035)

Build or test failure, click here for results.

To reproduce, try gomote repro 8723115269247575425.

Additional links for debugging:

• Output for go tool dist test -json [shard 2]
• Output for go tool dist test -json [shard 3]
• Output for go tool dist test -json [shard 4]

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Patch Set 5:

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Tryjob golang/try/gotip-linux-amd64-misccompile has failed with summary (view all results):

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• go on master (change 649035)

Error:

shard 4: failed to run compile goos:"freebsd" goarch:"riscv64" port: exit status 1
failed to run compile goos:"illumos" goarch:"amd64" port: exit status 1
failed to run compile goos:"js" goarch:"wasm" port: exit status 1
failed to run compile goos:"linux" goarch:"arm" port: exit status 1

Additional links for debugging:

• Output for compile goos:"freebsd" goarch:"riscv64" port [shard 4]
• Output for compile goos:"illumos" goarch:"amd64" port [shard 4]
• Output for compile goos:"js" goarch:"wasm" port [shard 4]
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• Shard 4 encountered a non-build/non-test failure, click here for the shard's build page

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Patch Set 5:

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Patch Set 6: Commit-Queue+1

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Patch Set 6:

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Tryjob golang/try/gotip-linux-amd64-typesalias has failed with summary (view all results):

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To reproduce, try gomote repro 8722694404581691249.

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• Output for go tool dist test -json [shard 1]

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Patch Set 7: Commit-Queue+1

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