Optimized away the creation of empty string objects. #6502
Merged
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Prior to this CL, creating an empty message object would create
two empty string objects for every declared field. First we
created a unique string object for the field's default. Then
we created yet another string object when we assigned the
default value into the message: we called #encode to ensure
that the string would have the correct encoding and be frozen.
I optimized these unnecessary objects away with two fixes:
string for every field's default.
a new string if the assigned string has the correct encoding and
is already frozen.