[StaticDataLayout][MemProf] Record whether the IR is compiled with data access profiles by module flag. (#162333)

The codegen pass in the pipeline can read the module flag to tell
whether the IR is compiled with data access profile, to support two use
cases when `memprof-annotate-static-data-prefix=true` is enabled

1. The binary is compiled with data access profiles. 
- The module flag will have value 1, and codegen pass should regard an
empty section prefix as 'unknown' and conservatively not placing the
data into `.unlikely` data sections.

2. The binary is compiled without data access profiles (e.g., during
incremental rollout, etc)
- The module flag will have value 0, and codegen pass can override an
empty section prefix based on PGO counters.

https://github.com/llvm/llvm-project/pull/155337 shows the motivating
use case in function `StaticDataProfileInfo::getConstantSectionPrefix`
in `llvm/lib/Analysis/StaticDataProfileInfo.cpp`

This is the 1st patch as a split of
https://github.com/llvm/llvm-project/pull/155337

0 files changed, 0 insertions, 0 deletions