Rename struct ICorJitInfo::ProfileBuffer to ICorJitInfo::BlockCounts

Rename struct ICorJitInfo::ProfileBuffer        to ICorJitInfo::BlockCounts
Rename method ICorJitInfo::allocBBProfileBuffer to ICorJitInfo::allocMethodBlockCounts
Rename method ICorJitInfo::getBBProfileData     to ICorJitInfo:"getMethodBlockCounts
Rename args and use DWORD instead of ULONG for ICorJitInfo:allocMethodBlockCounts and ICorJitInfo:getMethodBlockCounts
Rename Compiler::fgProfileBuffer  to Compiler::fgBlockCounts
Use an #ifdef FEATURE_CORECLR to fix the missing CORINFO_FLG_DISABLE_TIER0_FOR_LOOPS flag on the desktop.
Make fgBlockCountsCount and fgNumProfileRuns DWORDs instead of ULONGs
Rename local var bbCurrentBlockProfileBuffer to currentBlockCounts
Rename local var bbProfileBufferStart to profileBlockCountsStart
Use DWORD when iterating over BlockCounts instead of ULONG
Rename ZapImage::hashBBProfileData to ZapImage::hashMethodBlockCounts
SuperPMI - Fixed all references to allocBBProfileBuffer => allocMethodBlockCounts
SuperPMI - fixed all reference to getBBProfileBuffer => getMethodBlockCounts

Commit migrated from https://github.com/dotnet/coreclr/commit/68b4810203d7f6f1b4b7a4823a8d7610cda44190