[llvm] Change how branch weight is annotated for direct call (PR #90315)

[William Junda Huang via llvm-commits]

huangjd wrote:

Affected test cases
```
  LLVM :: Transforms/SampleProfile/calls.ll
  LLVM :: Transforms/SampleProfile/fsafdo_test.ll
  LLVM :: Transforms/SampleProfile/profile-context-tracker.ll
```
I am including the test cases' authors as reviewers, in case the input data was written intentionally for a purpose. 
 @dnovillo wrote calls.ll but I couldn't add as reviewer. 

https://github.com/llvm/llvm-project/pull/90315