internal/fuzz: test_fuzz_mutate_crash failure on windows/amd64 due to failure to find float64 crasher

[bcmills]

--- FAIL: TestScript (0.01s)
    --- FAIL: TestScript/test_fuzz_mutate_crash (88.46s)
        script_test.go:260: 
            # Tests that a crash caused by a mutator-discovered input writes the bad input
            # to testdata, and fails+reports correctly. This tests the end-to-end behavior
            # of the mutator finding a crash while fuzzing, adding it as a regression test
            # to the seed corpus in testdata, and failing the next time the test is run. (0.000s)
            # Running the seed corpus for all of the targets should pass the first
            # time, since nothing in the seed corpus will cause a crash. (2.332s)
            # Running the fuzzer should find a crashing input quickly. (12.085s)
            # Now, the failing bytes should have been added to the seed corpus for
            # the target, and should fail when run without fuzzing. (62.971s)
            # Running the fuzzer should find a crashing input quickly for fuzzing two types. (2.694s)
            # Running the fuzzer should find a crashing input quickly for an integer. (4.696s)
            # Running the fuzzer should find a crashing input quickly for a bool. (2.045s)
            # Running the fuzzer should find a crashing input quickly for a float. (1.497s)
            > ! go test -run=FuzzFloat -fuzz=FuzzFloat -fuzztime=100x -fuzzminimizetime=1000x
            [stdout]
            warning: starting with empty corpus
            fuzz: elapsed: 0s, execs: 0 (0/sec), new interesting: 0 (total: 0)
            fuzz: elapsed: 0s, execs: 100 (806/sec), new interesting: 1 (total: 1)
            PASS
            ok  	m	0.271s
            FAIL: testdata\script\test_fuzz_mutate_crash.txt:89: unexpected command success
            
FAIL
FAIL	cmd/go	210.036s

greplogs -l -e 'FAIL: TestScript/test_fuzz_mutate_crash .*(\n\s+.*)* unexpected command success'
2022-05-10T19:40:04-526de61/windows-amd64-longtest

(attn @golang/fuzzing)

[gopherbot]

Change https://go.dev/cl/405855 mentions this issue: cmd/go: don't assume decimal in test_fuzz_mutate_crash