[gcov] Fix gcov profiling on big-endian machines
Two fixes required to handle big-endian systems:
- 64-bit counter values are stored in a mixed-endian format in the
gcov files: a 32-bit low-part followed by a 32-bit high part. Note that
this is already implemented correctly on the LLVM side, see
GCOVBuffer::readInt64.
- The tag values (e.g. arcs tag, object summary tag, ...) are aways
written as the same sequence of bytes independent of byte order. But
when *reading* them back in, the code reads them as 32-bit values in
host byte order. For the comparisons to work correctly, this should
instead always read them as little-endian values.
Fixes PR 38121.
Reviewed By: marco-c
Differential Revision: https://reviews.llvm.org/D49132
llvm-svn: 336693