PPC NCG: Do not generate redundant section directives for exported symbols
Summary
In #18237 (closed) we found a duplication of .section ".toc","aw"
directives.
All symbols are printed at the end of code generation and hence one
directive would be sufficient and repeating the directive for each symbol
leads to assembler files that are much larger than necessary.
Steps to reproduce
Compile any Haskell or Cmm file to assembler code and look for .section
directives.
Expected behavior
Have a single .section declaration for TOC.
Environment
- GHC version used: HEAD, but also present since we have PPC NCG on powerpc64
Optional:
- Operating System: Linux, FreeBSD
- System Architecture: powerpc64 (perhaps also powerpc64le)