[clang] Merge lifetimebound and GSL code paths for lifetime analysis (#104906)

In the current lifetime analysis, we have two parallel code paths: one
for lifetimebound and another for GSL. These paths perform the same
logic, both determining whether to continue visiting subexpressions.

This PR merges the two paths into a single code path. As a result, we'll
reduce the overhead by eliminating a redundant visit to subexpressions.
The change is mostly NFC (No Functional Change). The only notable
difference is that when a subexpression is visited due to either
lifetimebound or GSL, we will prioritize the lifetimebound path. This
means the final diagnostic will be -Wdangling (rather than both
`-Wdangling` and `-Wdangling-gsl`)

This might cause a slight change in behavior if the -Wdangling
diagnostic is disabled, but I think this is not a major concern since
both diagnostics are enabled by default.

Fixes #93386

0 files changed, 0 insertions, 0 deletions