Use structurally equal values as Map vs IdentityMap keys

Canonical source: protos/examples/collections/path-keys.protos at locked revision e99b712ecf658a527b1fe82c8beba2c1286d8dc9.

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// Equal Path values are one Map key but remain two IdentityMap keys.
a: Path.relative().child("same")
b: Path.relative().child("same")
byValue: Map()
byValue[a] = 10
byValue[b] = 20
byIdentity: IdentityMap()
byIdentity[a] = 10
byIdentity[b] = 20
print(byValue.size())
print(byIdentity.size())

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