Using the correct integer compression to get decompression working space size

[NickWu]

Description of Change(s)

There is an issue in _DecompressIntegers function regarding dealing with integers bigger than 4 bytes. When dealing with integers bigger than 4 bytes, it is still using Usd_IntegerCompression::GetDecompressionWorkingSpaceSize to calculate the output buffer size where it should have used Usd_IntegerCompression64::GetDecompressionWorkingSpaceSize instead.

This is the fix for this issue #2434

Fixes Issue(s)

• Fixed an error at https://github.com/PixarAnimationStudios/USD/blob/release/pxr/base/tf/fastCompression.cpp#L116

• I have verified that all unit tests pass with the proposed changes

• I have submitted a signed Contributor License Agreement

[tallytalwar]

Filed as internal issue #USD-8319