Adapt tests for arm64

[aderouineau]

All tests for "EB" fail on arm64:

--- FAIL: TestBytesParse (0.00s)
    bytes_test.go:211:
        	Error Trace:	bytes_test.go:211
        	Error:      	Should be true
        	Test:       	TestBytesParse
    bytes_test.go:215:
        	Error Trace:	bytes_test.go:215
        	Error:      	Should be true
        	Test:       	TestBytesParse
    bytes_test.go:221:
        	Error Trace:	bytes_test.go:221
        	Error:      	Should be true
        	Test:       	TestBytesParse
    bytes_test.go:225:
        	Error Trace:	bytes_test.go:225
        	Error:      	Should be true
        	Test:       	TestBytesParse

This is because the conversion from float64 to int64 is implementation specific (see golang/go#45588). The test on arm64 should be b == math.MaxInt64.

This change moves the "EB" tests in platform-specific test files.