cmd/go: GOMIPS environment variable does not affect caching of mipsle code #27260
Description
This script shows that the results of compiling with GOARCH=mipsle are cached without regard to the value of the GOMIPS environment variable.
> cat foo.go
package p
func F(f float64) float64 {
return f + f
}
> go clean -cache
> GOARCH=mipsle go build -gcflags=-S foo.go 2>&1 | grep F0
0x0000 00000 (/home/iant/foo10.go:4) MOVF "".f(FP), F0
0x0008 00008 (/home/iant/foo10.go:4) ADDD F0, F0, F0
0x000c 00012 (/home/iant/foo10.go:4) MOVF F0, "".~r1+8(FP)
> GOARCH=mipsle GOMIPS=softfloat go build -gcflags=-S foo.go 2>&1 | grep F0
0x0000 00000 (/home/iant/foo10.go:4) MOVF "".f(FP), F0
0x0008 00008 (/home/iant/foo10.go:4) ADDD F0, F0, F0
0x000c 00012 (/home/iant/foo10.go:4) MOVF F0, "".~r1+8(FP)
> go clean -cache
> GOARCH=mipsle GOMIPS=softfloat go build -gcflags=-S foo.go 2>&1 | grep F0
>