[macros] Support shrinking value transmutes#2570
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In
transmute!, support an#![allow(shrink)]attribute which isinvoked as follows:
transmute!(#![allow(shrink)] src);
When this attribute is provided,
transmute!will permit shrinkingtransmutes, in which the destination value may be smaller than the
source value.
This PR is on branch transmute-ref-dst.