RFR: 8287400: Make BitMap range parameter names consistent

[Afshin Zafari]

On Sat, 26 Nov 2022 22:16:34 GMT, Afshin Zafari <duke at openjdk.org> wrote:

> The ranges are determined by 'start' and 'end' all over the bitMap.hpp and bitMap.cpp. All instances of other names for start and end are replaced.

All the ranges are determined by 'beg' and 'end'. 
Test: build local.

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PR: https://git.openjdk.org/jdk/pull/11375