Repository: go
Issue: cmd/compile: long symbol names for instantiated generics => large object files (though not executables)
Labels: NeedsInvestigation,generics,compiler/runtime

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### What version of Go are you using (`go version`)?

<pre>
$ go version
go version devel go1.18-f154f8b Tue Jan 4 22:27:20 2022 +0000 darwin/amd64
</pre>

### Does this issue reproduce with the latest release?
Yes


### What operating system and processor architecture are you using (`go env`)?

<details><summary><code>go env</code> Output</summary><br><pre>
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/gura/Library/Caches/go-build"
GOENV="/Users/gura/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/gura/go/pkg/mod"
GONOPROXY="*.uangel.com"
GONOSUMDB="*.uangel.com"
GOOS="darwin"
GOPATH="/Users/gura/go"
GOPRIVATE="*.uangel.com"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/Users/gura/sdk/gotip"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/Users/gura/sdk/gotip/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="devel go1.18-f154f8b Tue Jan 4 22:27:20 2022 +0000"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/Users/gura/test/fp/go.mod"
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/y1/bngm83dj5_5dcsgh9yrwvpm00000gp/T/go-build228120003=/tmp/go-build -gno-record-gcc-switches -fno-common"
</pre></details>

### What did you do?



<!--
If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on go.dev/play is best.
-->
```
$ git clone -b build-cache https://github.com/csgura/fp.git
$ cd fp
$ gotip clean -cache
$ du -hs ~/Library/Caches/go-build/
8.0K	/Users/gura/Library/Caches/go-build/

$ gotip test ./...

$ du -hs ~/Library/Caches/go-build/
1.4G	/Users/gura/Library/Caches/go-build/

```

### What did you expect to see?
A build cache directory of a reasonable size ,
or 
Warning about incorrectly used generic type.

### What did you see instead?
```
$ du -hs ~/Library/Caches/go-build/
1.4G	/Users/gura/Library/Caches/go-build/
```


Please excuse my poor English.

It seems to be related to this issue as well.  https://github.com/golang/go/issues/50204

I have written some algebraic data types to test the generic of Go 1.18.
( https://github.com/csgura/fp.git )
After running the tests, I noticed that the build cache was using a very large amount of disk.
I guess the cause lies in the some recursive type ( HList and curried Func ) and the interface type that uses the type parameter.

When I modified the code so that a generic interface type does not return other generic interface type,
The size of the build cache has been significantly reduced.
This fix is applied in the master branch.
```
$ git checkout master
$ gotip clean -cache
$ gotip test ./...
$ du -hs ~/Library/Caches/go-build/
176M	/Users/gura/Library/Caches/go-build/
```

It will not become a problem right now, but I think it will become a big problem as more and more projects use generics.