maplinear.go: too slow

[gopherbot]

#!watchflakes
post <- pkg == "maplinear.go" && test == ""

Issue created automatically to collect these failures.

Example (log):

# go run run.go -- maplinear.go
exit status 2
panic: iterdelete: too slow: 40000 inserts: 1.629930923s; 80000 inserts: 6.155884559s


goroutine 1 [running]:
panic({0xc8660, 0x40c060})
	/tmp/gobuilder-mips64/go/src/runtime/panic.go:1015 +0x528 fp=0x45ef3c sp=0x45eedc pc=0x50b48
main.checkLinear({0xd4942, 0xa}, 0x9c4, 0xdbf2c)
	/tmp/gobuilder-mips64/go/test/maplinear.go:59 +0x2bc fp=0x45efac sp=0x45ef3c pc=0xba76c
main.main()
	/tmp/gobuilder-mips64/go/test/maplinear.go:158 +0x210 fp=0x45efc0 sp=0x45efac pc=0xbaa50
runtime.main()
	/tmp/gobuilder-mips64/go/src/runtime/proc.go:250 +0x2b0 fp=0x45efec sp=0x45efc0 pc=0x54770
runtime.goexit()
	/tmp/gobuilder-mips64/go/src/runtime/asm_mipsx.s:617 +0x4 fp=0x45efec sp=0x45efec pc=0x8aa58

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "maplinear.go" && test == ""

2023-02-02 23:40 linux-mips-rtrk go@683b2c46 maplinear.go (log)

# go run run.go -- maplinear.go
exit status 2
panic: iterdelete: too slow: 40000 inserts: 1.629930923s; 80000 inserts: 6.155884559s


goroutine 1 [running]:
panic({0xc8660, 0x40c060})
	/tmp/gobuilder-mips64/go/src/runtime/panic.go:1015 +0x528 fp=0x45ef3c sp=0x45eedc pc=0x50b48
main.checkLinear({0xd4942, 0xa}, 0x9c4, 0xdbf2c)
	/tmp/gobuilder-mips64/go/test/maplinear.go:59 +0x2bc fp=0x45efac sp=0x45ef3c pc=0xba76c
main.main()
	/tmp/gobuilder-mips64/go/test/maplinear.go:158 +0x210 fp=0x45efc0 sp=0x45efac pc=0xbaa50
runtime.main()
	/tmp/gobuilder-mips64/go/src/runtime/proc.go:250 +0x2b0 fp=0x45efec sp=0x45efc0 pc=0x54770
runtime.goexit()
	/tmp/gobuilder-mips64/go/src/runtime/asm_mipsx.s:617 +0x4 fp=0x45efec sp=0x45efec pc=0x8aa58

— watchflakes

[cherrymui]

Dup of #53574.