fix: Improve floating point lint to handle ambiguous type (#15133)

Fixes: rust-lang/rust-clippy#14897, rust-lang/rust-clippy#10015

This is not a perfect solution, but it fixes the issue. Happy to discuss
further with the clippy team.

This PR refines check_mul_add to avoid false positives on ambiguous
float types (e.g., f32 vs f64). It improves type detection and ensures
mul_add is only suggested when the type is clear.

Changes:
- Improved detection of ambiguous float types
- Refined mul_add suggestion logic
- Added tests for ambiguous cases
## Example

Before this change, expressions like:
```rust
let x = 1.0; // ambiguous type
let _ = x * 2.0 + 0.5; // could incorrectly suggest mul_add
```

----

changelog: [`suboptimal_flops`]: improve handling of ambiguous float
types in mul_add suggestions

0 files changed, 0 insertions, 0 deletions