cmd/compile: improve issue62407_test

[zigo101]

The original issue62407_test also passes with versions prior to 1.23.
The improvement makes it fail with versions prior to 1.23.

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Keith Randall:

Patch Set 1: Code-Review+2

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[gopherbot]

Message from Keith Randall:

Patch Set 1: Code-Review+1

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[gopherbot]

Message from Cuong Manh Le:

Patch Set 1: Code-Review+2

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[gopherbot]

Message from Xu Liu:

Patch Set 1:

(1 comment)

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