Sample Profiles - Adjust integer types. Mostly NFC.

Sample Profiles - Adjust integer types. Mostly NFC.

This adjusts all integers in the reader/writer to reflect the types
stored on profile files. They should all be unsigned 32-bit or 64-bit
values. Changed all associated internal types to be uint32_t or
uint64_t.

The only place that needed some adjustments is in the sample profile
transformation. Altough the weight read from the profile are 64-bit
values, the internal API for branch weights only accepts 32-bit values.
The pass now saturates weights that overflow uint32_t.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@250427 91177308-0d34-0410-b5e6-96231b3b80d8