[llvm] [InstCombine] Add support for Instruction combining of hyperbolic functions (PR #173730)

[Yingwei Zheng via llvm-commits]

================
@@ -3074,6 +3074,33 @@ Instruction *InstCombinerImpl::visitCallInst(CallInst &CI) {
     }
     break;
   }
+  case Intrinsic::cosh: {
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dtcxzyw wrote:

Will we have more specific optimization about hyperbolic functions? If not, I'd like to merge the paths for odd/even functions:
```
case cos:
case cosh:
    // path for even functions
case sin:
case sinh:
case tan:
case tanh:
   // path for odd functions
```

https://github.com/llvm/llvm-project/pull/173730